PHP's crc32 in TypeScript

How to use

Install via yarn add locutus and import: import { crc32 } from 'locutus/php/strings/crc32'.

Or with CommonJS: const { crc32 } = require('locutus/php/strings/crc32')

Use a bundler that supports tree-shaking so you only ship the functions you actually use. Vite, webpack, Rollup, and Parcel all handle this. For server-side use this is less of a concern.

Examples

These examples are extracted from test cases that automatically verify our functions against their native counterparts.

#	code	expected result
1	crc32('Kevin van Zonneveld')	1249991249

Dependencies

This function uses the following Locutus functions:

• utf8_encode (php/xml)

Here's what our current TypeScript equivalent to PHP's crc32 looks like.

TSTypeScript JSJavaScript TSStandalone TS JSStandalone JS

Copy code

import { utf8_encode as utf8Encode } from '../xml/utf8_encode.ts'

export function crc32(str: string): number {
  //      discuss at: https://locutus.io/php/crc32/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: T0bsn
  //       example 1: crc32('Kevin van Zonneveld')
  //       returns 1: 1249991249

  str = utf8Encode(str)
  const table = [
    '00000000',
    '77073096',
    'EE0E612C',
    '990951BA',
    '076DC419',
    '706AF48F',
    'E963A535',
    '9E6495A3',
    '0EDB8832',
    '79DCB8A4',
    'E0D5E91E',
    '97D2D988',
    '09B64C2B',
    '7EB17CBD',
    'E7B82D07',
    '90BF1D91',
    '1DB71064',
    '6AB020F2',
    'F3B97148',
    '84BE41DE',
    '1ADAD47D',
    '6DDDE4EB',
    'F4D4B551',
    '83D385C7',
    '136C9856',
    '646BA8C0',
    'FD62F97A',
    '8A65C9EC',
    '14015C4F',
    '63066CD9',
    'FA0F3D63',
    '8D080DF5',
    '3B6E20C8',
    '4C69105E',
    'D56041E4',
    'A2677172',
    '3C03E4D1',
    '4B04D447',
    'D20D85FD',
    'A50AB56B',
    '35B5A8FA',
    '42B2986C',
    'DBBBC9D6',
    'ACBCF940',
    '32D86CE3',
    '45DF5C75',
    'DCD60DCF',
    'ABD13D59',
    '26D930AC',
    '51DE003A',
    'C8D75180',
    'BFD06116',
    '21B4F4B5',
    '56B3C423',
    'CFBA9599',
    'B8BDA50F',
    '2802B89E',
    '5F058808',
    'C60CD9B2',
    'B10BE924',
    '2F6F7C87',
    '58684C11',
    'C1611DAB',
    'B6662D3D',
    '76DC4190',
    '01DB7106',
    '98D220BC',
    'EFD5102A',
    '71B18589',
    '06B6B51F',
    '9FBFE4A5',
    'E8B8D433',
    '7807C9A2',
    '0F00F934',
    '9609A88E',
    'E10E9818',
    '7F6A0DBB',
    '086D3D2D',
    '91646C97',
    'E6635C01',
    '6B6B51F4',
    '1C6C6162',
    '856530D8',
    'F262004E',
    '6C0695ED',
    '1B01A57B',
    '8208F4C1',
    'F50FC457',
    '65B0D9C6',
    '12B7E950',
    '8BBEB8EA',
    'FCB9887C',
    '62DD1DDF',
    '15DA2D49',
    '8CD37CF3',
    'FBD44C65',
    '4DB26158',
    '3AB551CE',
    'A3BC0074',
    'D4BB30E2',
    '4ADFA541',
    '3DD895D7',
    'A4D1C46D',
    'D3D6F4FB',
    '4369E96A',
    '346ED9FC',
    'AD678846',
    'DA60B8D0',
    '44042D73',
    '33031DE5',
    'AA0A4C5F',
    'DD0D7CC9',
    '5005713C',
    '270241AA',
    'BE0B1010',
    'C90C2086',
    '5768B525',
    '206F85B3',
    'B966D409',
    'CE61E49F',
    '5EDEF90E',
    '29D9C998',
    'B0D09822',
    'C7D7A8B4',
    '59B33D17',
    '2EB40D81',
    'B7BD5C3B',
    'C0BA6CAD',
    'EDB88320',
    '9ABFB3B6',
    '03B6E20C',
    '74B1D29A',
    'EAD54739',
    '9DD277AF',
    '04DB2615',
    '73DC1683',
    'E3630B12',
    '94643B84',
    '0D6D6A3E',
    '7A6A5AA8',
    'E40ECF0B',
    '9309FF9D',
    '0A00AE27',
    '7D079EB1',
    'F00F9344',
    '8708A3D2',
    '1E01F268',
    '6906C2FE',
    'F762575D',
    '806567CB',
    '196C3671',
    '6E6B06E7',
    'FED41B76',
    '89D32BE0',
    '10DA7A5A',
    '67DD4ACC',
    'F9B9DF6F',
    '8EBEEFF9',
    '17B7BE43',
    '60B08ED5',
    'D6D6A3E8',
    'A1D1937E',
    '38D8C2C4',
    '4FDFF252',
    'D1BB67F1',
    'A6BC5767',
    '3FB506DD',
    '48B2364B',
    'D80D2BDA',
    'AF0A1B4C',
    '36034AF6',
    '41047A60',
    'DF60EFC3',
    'A867DF55',
    '316E8EEF',
    '4669BE79',
    'CB61B38C',
    'BC66831A',
    '256FD2A0',
    '5268E236',
    'CC0C7795',
    'BB0B4703',
    '220216B9',
    '5505262F',
    'C5BA3BBE',
    'B2BD0B28',
    '2BB45A92',
    '5CB36A04',
    'C2D7FFA7',
    'B5D0CF31',
    '2CD99E8B',
    '5BDEAE1D',
    '9B64C2B0',
    'EC63F226',
    '756AA39C',
    '026D930A',
    '9C0906A9',
    'EB0E363F',
    '72076785',
    '05005713',
    '95BF4A82',
    'E2B87A14',
    '7BB12BAE',
    '0CB61B38',
    '92D28E9B',
    'E5D5BE0D',
    '7CDCEFB7',
    '0BDBDF21',
    '86D3D2D4',
    'F1D4E242',
    '68DDB3F8',
    '1FDA836E',
    '81BE16CD',
    'F6B9265B',
    '6FB077E1',
    '18B74777',
    '88085AE6',
    'FF0F6A70',
    '66063BCA',
    '11010B5C',
    '8F659EFF',
    'F862AE69',
    '616BFFD3',
    '166CCF45',
    'A00AE278',
    'D70DD2EE',
    '4E048354',
    '3903B3C2',
    'A7672661',
    'D06016F7',
    '4969474D',
    '3E6E77DB',
    'AED16A4A',
    'D9D65ADC',
    '40DF0B66',
    '37D83BF0',
    'A9BCAE53',
    'DEBB9EC5',
    '47B2CF7F',
    '30B5FFE9',
    'BDBDF21C',
    'CABAC28A',
    '53B39330',
    '24B4A3A6',
    'BAD03605',
    'CDD70693',
    '54DE5729',
    '23D967BF',
    'B3667A2E',
    'C4614AB8',
    '5D681B02',
    '2A6F2B94',
    'B40BBE37',
    'C30C8EA1',
    '5A05DF1B',
    '2D02EF8D',
  ].join(' ')
  // @todo: ^-- Now that `table` is an array, maybe we can use that directly using slices,
  // instead of converting it to a string and substringing

  let crc = 0
  let x = 0
  let y = 0

  crc = crc ^ -1
  for (let i = 0, iTop = str.length; i < iTop; i++) {
    y = (crc ^ str.charCodeAt(i)) & 0xff
    x = Number.parseInt('0x' + table.substr(y * 9, 8), 16)
    crc = (crc >>> 8) ^ x
  }

  return crc ^ -1
}

import { utf8_encode as utf8Encode } from '../xml/utf8_encode.ts'

export function crc32(str) {
  //      discuss at: https://locutus.io/php/crc32/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: T0bsn
  //       example 1: crc32('Kevin van Zonneveld')
  //       returns 1: 1249991249

  str = utf8Encode(str)
  const table = [
    '00000000',
    '77073096',
    'EE0E612C',
    '990951BA',
    '076DC419',
    '706AF48F',
    'E963A535',
    '9E6495A3',
    '0EDB8832',
    '79DCB8A4',
    'E0D5E91E',
    '97D2D988',
    '09B64C2B',
    '7EB17CBD',
    'E7B82D07',
    '90BF1D91',
    '1DB71064',
    '6AB020F2',
    'F3B97148',
    '84BE41DE',
    '1ADAD47D',
    '6DDDE4EB',
    'F4D4B551',
    '83D385C7',
    '136C9856',
    '646BA8C0',
    'FD62F97A',
    '8A65C9EC',
    '14015C4F',
    '63066CD9',
    'FA0F3D63',
    '8D080DF5',
    '3B6E20C8',
    '4C69105E',
    'D56041E4',
    'A2677172',
    '3C03E4D1',
    '4B04D447',
    'D20D85FD',
    'A50AB56B',
    '35B5A8FA',
    '42B2986C',
    'DBBBC9D6',
    'ACBCF940',
    '32D86CE3',
    '45DF5C75',
    'DCD60DCF',
    'ABD13D59',
    '26D930AC',
    '51DE003A',
    'C8D75180',
    'BFD06116',
    '21B4F4B5',
    '56B3C423',
    'CFBA9599',
    'B8BDA50F',
    '2802B89E',
    '5F058808',
    'C60CD9B2',
    'B10BE924',
    '2F6F7C87',
    '58684C11',
    'C1611DAB',
    'B6662D3D',
    '76DC4190',
    '01DB7106',
    '98D220BC',
    'EFD5102A',
    '71B18589',
    '06B6B51F',
    '9FBFE4A5',
    'E8B8D433',
    '7807C9A2',
    '0F00F934',
    '9609A88E',
    'E10E9818',
    '7F6A0DBB',
    '086D3D2D',
    '91646C97',
    'E6635C01',
    '6B6B51F4',
    '1C6C6162',
    '856530D8',
    'F262004E',
    '6C0695ED',
    '1B01A57B',
    '8208F4C1',
    'F50FC457',
    '65B0D9C6',
    '12B7E950',
    '8BBEB8EA',
    'FCB9887C',
    '62DD1DDF',
    '15DA2D49',
    '8CD37CF3',
    'FBD44C65',
    '4DB26158',
    '3AB551CE',
    'A3BC0074',
    'D4BB30E2',
    '4ADFA541',
    '3DD895D7',
    'A4D1C46D',
    'D3D6F4FB',
    '4369E96A',
    '346ED9FC',
    'AD678846',
    'DA60B8D0',
    '44042D73',
    '33031DE5',
    'AA0A4C5F',
    'DD0D7CC9',
    '5005713C',
    '270241AA',
    'BE0B1010',
    'C90C2086',
    '5768B525',
    '206F85B3',
    'B966D409',
    'CE61E49F',
    '5EDEF90E',
    '29D9C998',
    'B0D09822',
    'C7D7A8B4',
    '59B33D17',
    '2EB40D81',
    'B7BD5C3B',
    'C0BA6CAD',
    'EDB88320',
    '9ABFB3B6',
    '03B6E20C',
    '74B1D29A',
    'EAD54739',
    '9DD277AF',
    '04DB2615',
    '73DC1683',
    'E3630B12',
    '94643B84',
    '0D6D6A3E',
    '7A6A5AA8',
    'E40ECF0B',
    '9309FF9D',
    '0A00AE27',
    '7D079EB1',
    'F00F9344',
    '8708A3D2',
    '1E01F268',
    '6906C2FE',
    'F762575D',
    '806567CB',
    '196C3671',
    '6E6B06E7',
    'FED41B76',
    '89D32BE0',
    '10DA7A5A',
    '67DD4ACC',
    'F9B9DF6F',
    '8EBEEFF9',
    '17B7BE43',
    '60B08ED5',
    'D6D6A3E8',
    'A1D1937E',
    '38D8C2C4',
    '4FDFF252',
    'D1BB67F1',
    'A6BC5767',
    '3FB506DD',
    '48B2364B',
    'D80D2BDA',
    'AF0A1B4C',
    '36034AF6',
    '41047A60',
    'DF60EFC3',
    'A867DF55',
    '316E8EEF',
    '4669BE79',
    'CB61B38C',
    'BC66831A',
    '256FD2A0',
    '5268E236',
    'CC0C7795',
    'BB0B4703',
    '220216B9',
    '5505262F',
    'C5BA3BBE',
    'B2BD0B28',
    '2BB45A92',
    '5CB36A04',
    'C2D7FFA7',
    'B5D0CF31',
    '2CD99E8B',
    '5BDEAE1D',
    '9B64C2B0',
    'EC63F226',
    '756AA39C',
    '026D930A',
    '9C0906A9',
    'EB0E363F',
    '72076785',
    '05005713',
    '95BF4A82',
    'E2B87A14',
    '7BB12BAE',
    '0CB61B38',
    '92D28E9B',
    'E5D5BE0D',
    '7CDCEFB7',
    '0BDBDF21',
    '86D3D2D4',
    'F1D4E242',
    '68DDB3F8',
    '1FDA836E',
    '81BE16CD',
    'F6B9265B',
    '6FB077E1',
    '18B74777',
    '88085AE6',
    'FF0F6A70',
    '66063BCA',
    '11010B5C',
    '8F659EFF',
    'F862AE69',
    '616BFFD3',
    '166CCF45',
    'A00AE278',
    'D70DD2EE',
    '4E048354',
    '3903B3C2',
    'A7672661',
    'D06016F7',
    '4969474D',
    '3E6E77DB',
    'AED16A4A',
    'D9D65ADC',
    '40DF0B66',
    '37D83BF0',
    'A9BCAE53',
    'DEBB9EC5',
    '47B2CF7F',
    '30B5FFE9',
    'BDBDF21C',
    'CABAC28A',
    '53B39330',
    '24B4A3A6',
    'BAD03605',
    'CDD70693',
    '54DE5729',
    '23D967BF',
    'B3667A2E',
    'C4614AB8',
    '5D681B02',
    '2A6F2B94',
    'B40BBE37',
    'C30C8EA1',
    '5A05DF1B',
    '2D02EF8D',
  ].join(' ')
  // @todo: ^-- Now that `table` is an array, maybe we can use that directly using slices,
  // instead of converting it to a string and substringing

  let crc = 0
  let x = 0
  let y = 0

  crc = crc ^ -1
  for (let i = 0, iTop = str.length; i < iTop; i++) {
    y = (crc ^ str.charCodeAt(i)) & 0xff
    x = Number.parseInt('0x' + table.substr(y * 9, 8), 16)
    crc = (crc >>> 8) ^ x
  }

  return crc ^ -1
}

// php/xml/utf8_encode (Locutus dependency module)
function utf8_encode(argString: string | null | undefined): string {
  //      discuss at: https://locutus.io/php/utf8_encode/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: sowberry
  //     improved by: Jack
  //     improved by: Yves Sucaet
  //     improved by: kirilloid
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //     bugfixed by: Ulrich
  //     bugfixed by: Rafał Kukawski (https://blog.kukawski.pl)
  //     bugfixed by: kirilloid
  //       example 1: utf8_encode('Kevin van Zonneveld')
  //       returns 1: 'Kevin van Zonneveld'

  if (argString === null || typeof argString === 'undefined') {
    return ''
  }

  // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
  const string = argString + ''
  let utftext = ''
  let start: number
  let end: number
  let stringl = 0

  start = end = 0
  stringl = string.length
  for (let n = 0; n < stringl; n++) {
    let c1 = string.charCodeAt(n)
    let enc: string | null = null

    if (c1 < 128) {
      end++
    } else if (c1 > 127 && c1 < 2048) {
      enc = String.fromCharCode((c1 >> 6) | 192, (c1 & 63) | 128)
    } else if ((c1 & 0xf800) !== 0xd800) {
      enc = String.fromCharCode((c1 >> 12) | 224, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128)
    } else {
      // surrogate pairs
      if ((c1 & 0xfc00) !== 0xd800) {
        throw new RangeError('Unmatched trail surrogate at ' + n)
      }
      const c2 = string.charCodeAt(++n)
      if ((c2 & 0xfc00) !== 0xdc00) {
        throw new RangeError('Unmatched lead surrogate at ' + (n - 1))
      }
      c1 = ((c1 & 0x3ff) << 10) + (c2 & 0x3ff) + 0x10000
      enc = String.fromCharCode((c1 >> 18) | 240, ((c1 >> 12) & 63) | 128, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128)
    }
    if (enc !== null) {
      if (end > start) {
        utftext += string.slice(start, end)
      }
      utftext += enc
      start = end = n + 1
    }
  }

  if (end > start) {
    utftext += string.slice(start, stringl)
  }

  return utftext
}

// php/strings/crc32 (target function module)
const utf8Encode = utf8_encode;

function crc32(str: string): number {
  //      discuss at: https://locutus.io/php/crc32/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: T0bsn
  //       example 1: crc32('Kevin van Zonneveld')
  //       returns 1: 1249991249

  str = utf8Encode(str)
  const table = [
    '00000000',
    '77073096',
    'EE0E612C',
    '990951BA',
    '076DC419',
    '706AF48F',
    'E963A535',
    '9E6495A3',
    '0EDB8832',
    '79DCB8A4',
    'E0D5E91E',
    '97D2D988',
    '09B64C2B',
    '7EB17CBD',
    'E7B82D07',
    '90BF1D91',
    '1DB71064',
    '6AB020F2',
    'F3B97148',
    '84BE41DE',
    '1ADAD47D',
    '6DDDE4EB',
    'F4D4B551',
    '83D385C7',
    '136C9856',
    '646BA8C0',
    'FD62F97A',
    '8A65C9EC',
    '14015C4F',
    '63066CD9',
    'FA0F3D63',
    '8D080DF5',
    '3B6E20C8',
    '4C69105E',
    'D56041E4',
    'A2677172',
    '3C03E4D1',
    '4B04D447',
    'D20D85FD',
    'A50AB56B',
    '35B5A8FA',
    '42B2986C',
    'DBBBC9D6',
    'ACBCF940',
    '32D86CE3',
    '45DF5C75',
    'DCD60DCF',
    'ABD13D59',
    '26D930AC',
    '51DE003A',
    'C8D75180',
    'BFD06116',
    '21B4F4B5',
    '56B3C423',
    'CFBA9599',
    'B8BDA50F',
    '2802B89E',
    '5F058808',
    'C60CD9B2',
    'B10BE924',
    '2F6F7C87',
    '58684C11',
    'C1611DAB',
    'B6662D3D',
    '76DC4190',
    '01DB7106',
    '98D220BC',
    'EFD5102A',
    '71B18589',
    '06B6B51F',
    '9FBFE4A5',
    'E8B8D433',
    '7807C9A2',
    '0F00F934',
    '9609A88E',
    'E10E9818',
    '7F6A0DBB',
    '086D3D2D',
    '91646C97',
    'E6635C01',
    '6B6B51F4',
    '1C6C6162',
    '856530D8',
    'F262004E',
    '6C0695ED',
    '1B01A57B',
    '8208F4C1',
    'F50FC457',
    '65B0D9C6',
    '12B7E950',
    '8BBEB8EA',
    'FCB9887C',
    '62DD1DDF',
    '15DA2D49',
    '8CD37CF3',
    'FBD44C65',
    '4DB26158',
    '3AB551CE',
    'A3BC0074',
    'D4BB30E2',
    '4ADFA541',
    '3DD895D7',
    'A4D1C46D',
    'D3D6F4FB',
    '4369E96A',
    '346ED9FC',
    'AD678846',
    'DA60B8D0',
    '44042D73',
    '33031DE5',
    'AA0A4C5F',
    'DD0D7CC9',
    '5005713C',
    '270241AA',
    'BE0B1010',
    'C90C2086',
    '5768B525',
    '206F85B3',
    'B966D409',
    'CE61E49F',
    '5EDEF90E',
    '29D9C998',
    'B0D09822',
    'C7D7A8B4',
    '59B33D17',
    '2EB40D81',
    'B7BD5C3B',
    'C0BA6CAD',
    'EDB88320',
    '9ABFB3B6',
    '03B6E20C',
    '74B1D29A',
    'EAD54739',
    '9DD277AF',
    '04DB2615',
    '73DC1683',
    'E3630B12',
    '94643B84',
    '0D6D6A3E',
    '7A6A5AA8',
    'E40ECF0B',
    '9309FF9D',
    '0A00AE27',
    '7D079EB1',
    'F00F9344',
    '8708A3D2',
    '1E01F268',
    '6906C2FE',
    'F762575D',
    '806567CB',
    '196C3671',
    '6E6B06E7',
    'FED41B76',
    '89D32BE0',
    '10DA7A5A',
    '67DD4ACC',
    'F9B9DF6F',
    '8EBEEFF9',
    '17B7BE43',
    '60B08ED5',
    'D6D6A3E8',
    'A1D1937E',
    '38D8C2C4',
    '4FDFF252',
    'D1BB67F1',
    'A6BC5767',
    '3FB506DD',
    '48B2364B',
    'D80D2BDA',
    'AF0A1B4C',
    '36034AF6',
    '41047A60',
    'DF60EFC3',
    'A867DF55',
    '316E8EEF',
    '4669BE79',
    'CB61B38C',
    'BC66831A',
    '256FD2A0',
    '5268E236',
    'CC0C7795',
    'BB0B4703',
    '220216B9',
    '5505262F',
    'C5BA3BBE',
    'B2BD0B28',
    '2BB45A92',
    '5CB36A04',
    'C2D7FFA7',
    'B5D0CF31',
    '2CD99E8B',
    '5BDEAE1D',
    '9B64C2B0',
    'EC63F226',
    '756AA39C',
    '026D930A',
    '9C0906A9',
    'EB0E363F',
    '72076785',
    '05005713',
    '95BF4A82',
    'E2B87A14',
    '7BB12BAE',
    '0CB61B38',
    '92D28E9B',
    'E5D5BE0D',
    '7CDCEFB7',
    '0BDBDF21',
    '86D3D2D4',
    'F1D4E242',
    '68DDB3F8',
    '1FDA836E',
    '81BE16CD',
    'F6B9265B',
    '6FB077E1',
    '18B74777',
    '88085AE6',
    'FF0F6A70',
    '66063BCA',
    '11010B5C',
    '8F659EFF',
    'F862AE69',
    '616BFFD3',
    '166CCF45',
    'A00AE278',
    'D70DD2EE',
    '4E048354',
    '3903B3C2',
    'A7672661',
    'D06016F7',
    '4969474D',
    '3E6E77DB',
    'AED16A4A',
    'D9D65ADC',
    '40DF0B66',
    '37D83BF0',
    'A9BCAE53',
    'DEBB9EC5',
    '47B2CF7F',
    '30B5FFE9',
    'BDBDF21C',
    'CABAC28A',
    '53B39330',
    '24B4A3A6',
    'BAD03605',
    'CDD70693',
    '54DE5729',
    '23D967BF',
    'B3667A2E',
    'C4614AB8',
    '5D681B02',
    '2A6F2B94',
    'B40BBE37',
    'C30C8EA1',
    '5A05DF1B',
    '2D02EF8D',
  ].join(' ')
  // @todo: ^-- Now that `table` is an array, maybe we can use that directly using slices,
  // instead of converting it to a string and substringing

  let crc = 0
  let x = 0
  let y = 0

  crc = crc ^ -1
  for (let i = 0, iTop = str.length; i < iTop; i++) {
    y = (crc ^ str.charCodeAt(i)) & 0xff
    x = Number.parseInt('0x' + table.substr(y * 9, 8), 16)
    crc = (crc >>> 8) ^ x
  }

  return crc ^ -1
}

// php/xml/utf8_encode (Locutus dependency module)
function utf8_encode(argString) {
  //      discuss at: https://locutus.io/php/utf8_encode/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: Kevin van Zonneveld (https://kvz.io)
  //     improved by: sowberry
  //     improved by: Jack
  //     improved by: Yves Sucaet
  //     improved by: kirilloid
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
  //     bugfixed by: Ulrich
  //     bugfixed by: Rafał Kukawski (https://blog.kukawski.pl)
  //     bugfixed by: kirilloid
  //       example 1: utf8_encode('Kevin van Zonneveld')
  //       returns 1: 'Kevin van Zonneveld'

  if (argString === null || typeof argString === 'undefined') {
    return ''
  }

  // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
  const string = argString + ''
  let utftext = ''
  let start
  let end
  let stringl = 0

  start = end = 0
  stringl = string.length
  for (let n = 0; n < stringl; n++) {
    let c1 = string.charCodeAt(n)
    let enc = null

    if (c1 < 128) {
      end++
    } else if (c1 > 127 && c1 < 2048) {
      enc = String.fromCharCode((c1 >> 6) | 192, (c1 & 63) | 128)
    } else if ((c1 & 0xf800) !== 0xd800) {
      enc = String.fromCharCode((c1 >> 12) | 224, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128)
    } else {
      // surrogate pairs
      if ((c1 & 0xfc00) !== 0xd800) {
        throw new RangeError('Unmatched trail surrogate at ' + n)
      }
      const c2 = string.charCodeAt(++n)
      if ((c2 & 0xfc00) !== 0xdc00) {
        throw new RangeError('Unmatched lead surrogate at ' + (n - 1))
      }
      c1 = ((c1 & 0x3ff) << 10) + (c2 & 0x3ff) + 0x10000
      enc = String.fromCharCode((c1 >> 18) | 240, ((c1 >> 12) & 63) | 128, ((c1 >> 6) & 63) | 128, (c1 & 63) | 128)
    }
    if (enc !== null) {
      if (end > start) {
        utftext += string.slice(start, end)
      }
      utftext += enc
      start = end = n + 1
    }
  }

  if (end > start) {
    utftext += string.slice(start, stringl)
  }

  return utftext
}

// php/strings/crc32 (target function module)
const utf8Encode = utf8_encode

function crc32(str) {
  //      discuss at: https://locutus.io/php/crc32/
  // parity verified: PHP 8.3
  //     original by: Webtoolkit.info (https://www.webtoolkit.info/)
  //     improved by: T0bsn
  //       example 1: crc32('Kevin van Zonneveld')
  //       returns 1: 1249991249

  str = utf8Encode(str)
  const table = [
    '00000000',
    '77073096',
    'EE0E612C',
    '990951BA',
    '076DC419',
    '706AF48F',
    'E963A535',
    '9E6495A3',
    '0EDB8832',
    '79DCB8A4',
    'E0D5E91E',
    '97D2D988',
    '09B64C2B',
    '7EB17CBD',
    'E7B82D07',
    '90BF1D91',
    '1DB71064',
    '6AB020F2',
    'F3B97148',
    '84BE41DE',
    '1ADAD47D',
    '6DDDE4EB',
    'F4D4B551',
    '83D385C7',
    '136C9856',
    '646BA8C0',
    'FD62F97A',
    '8A65C9EC',
    '14015C4F',
    '63066CD9',
    'FA0F3D63',
    '8D080DF5',
    '3B6E20C8',
    '4C69105E',
    'D56041E4',
    'A2677172',
    '3C03E4D1',
    '4B04D447',
    'D20D85FD',
    'A50AB56B',
    '35B5A8FA',
    '42B2986C',
    'DBBBC9D6',
    'ACBCF940',
    '32D86CE3',
    '45DF5C75',
    'DCD60DCF',
    'ABD13D59',
    '26D930AC',
    '51DE003A',
    'C8D75180',
    'BFD06116',
    '21B4F4B5',
    '56B3C423',
    'CFBA9599',
    'B8BDA50F',
    '2802B89E',
    '5F058808',
    'C60CD9B2',
    'B10BE924',
    '2F6F7C87',
    '58684C11',
    'C1611DAB',
    'B6662D3D',
    '76DC4190',
    '01DB7106',
    '98D220BC',
    'EFD5102A',
    '71B18589',
    '06B6B51F',
    '9FBFE4A5',
    'E8B8D433',
    '7807C9A2',
    '0F00F934',
    '9609A88E',
    'E10E9818',
    '7F6A0DBB',
    '086D3D2D',
    '91646C97',
    'E6635C01',
    '6B6B51F4',
    '1C6C6162',
    '856530D8',
    'F262004E',
    '6C0695ED',
    '1B01A57B',
    '8208F4C1',
    'F50FC457',
    '65B0D9C6',
    '12B7E950',
    '8BBEB8EA',
    'FCB9887C',
    '62DD1DDF',
    '15DA2D49',
    '8CD37CF3',
    'FBD44C65',
    '4DB26158',
    '3AB551CE',
    'A3BC0074',
    'D4BB30E2',
    '4ADFA541',
    '3DD895D7',
    'A4D1C46D',
    'D3D6F4FB',
    '4369E96A',
    '346ED9FC',
    'AD678846',
    'DA60B8D0',
    '44042D73',
    '33031DE5',
    'AA0A4C5F',
    'DD0D7CC9',
    '5005713C',
    '270241AA',
    'BE0B1010',
    'C90C2086',
    '5768B525',
    '206F85B3',
    'B966D409',
    'CE61E49F',
    '5EDEF90E',
    '29D9C998',
    'B0D09822',
    'C7D7A8B4',
    '59B33D17',
    '2EB40D81',
    'B7BD5C3B',
    'C0BA6CAD',
    'EDB88320',
    '9ABFB3B6',
    '03B6E20C',
    '74B1D29A',
    'EAD54739',
    '9DD277AF',
    '04DB2615',
    '73DC1683',
    'E3630B12',
    '94643B84',
    '0D6D6A3E',
    '7A6A5AA8',
    'E40ECF0B',
    '9309FF9D',
    '0A00AE27',
    '7D079EB1',
    'F00F9344',
    '8708A3D2',
    '1E01F268',
    '6906C2FE',
    'F762575D',
    '806567CB',
    '196C3671',
    '6E6B06E7',
    'FED41B76',
    '89D32BE0',
    '10DA7A5A',
    '67DD4ACC',
    'F9B9DF6F',
    '8EBEEFF9',
    '17B7BE43',
    '60B08ED5',
    'D6D6A3E8',
    'A1D1937E',
    '38D8C2C4',
    '4FDFF252',
    'D1BB67F1',
    'A6BC5767',
    '3FB506DD',
    '48B2364B',
    'D80D2BDA',
    'AF0A1B4C',
    '36034AF6',
    '41047A60',
    'DF60EFC3',
    'A867DF55',
    '316E8EEF',
    '4669BE79',
    'CB61B38C',
    'BC66831A',
    '256FD2A0',
    '5268E236',
    'CC0C7795',
    'BB0B4703',
    '220216B9',
    '5505262F',
    'C5BA3BBE',
    'B2BD0B28',
    '2BB45A92',
    '5CB36A04',
    'C2D7FFA7',
    'B5D0CF31',
    '2CD99E8B',
    '5BDEAE1D',
    '9B64C2B0',
    'EC63F226',
    '756AA39C',
    '026D930A',
    '9C0906A9',
    'EB0E363F',
    '72076785',
    '05005713',
    '95BF4A82',
    'E2B87A14',
    '7BB12BAE',
    '0CB61B38',
    '92D28E9B',
    'E5D5BE0D',
    '7CDCEFB7',
    '0BDBDF21',
    '86D3D2D4',
    'F1D4E242',
    '68DDB3F8',
    '1FDA836E',
    '81BE16CD',
    'F6B9265B',
    '6FB077E1',
    '18B74777',
    '88085AE6',
    'FF0F6A70',
    '66063BCA',
    '11010B5C',
    '8F659EFF',
    'F862AE69',
    '616BFFD3',
    '166CCF45',
    'A00AE278',
    'D70DD2EE',
    '4E048354',
    '3903B3C2',
    'A7672661',
    'D06016F7',
    '4969474D',
    '3E6E77DB',
    'AED16A4A',
    'D9D65ADC',
    '40DF0B66',
    '37D83BF0',
    'A9BCAE53',
    'DEBB9EC5',
    '47B2CF7F',
    '30B5FFE9',
    'BDBDF21C',
    'CABAC28A',
    '53B39330',
    '24B4A3A6',
    'BAD03605',
    'CDD70693',
    '54DE5729',
    '23D967BF',
    'B3667A2E',
    'C4614AB8',
    '5D681B02',
    '2A6F2B94',
    'B40BBE37',
    'C30C8EA1',
    '5A05DF1B',
    '2D02EF8D',
  ].join(' ')
  // @todo: ^-- Now that `table` is an array, maybe we can use that directly using slices,
  // instead of converting it to a string and substringing

  let crc = 0
  let x = 0
  let y = 0

  crc = crc ^ -1
  for (let i = 0, iTop = str.length; i < iTop; i++) {
    y = (crc ^ str.charCodeAt(i)) & 0xff
    x = Number.parseInt('0x' + table.substr(y * 9, 8), 16)
    crc = (crc >>> 8) ^ x
  }

  return crc ^ -1
}

Improve this function

Locutus is a community effort following The McDonald's Theory: we ship first iterations, hoping others will improve them. If you see something that could be better, we'd love your contribution.

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