» Javascript equivalent for PHP's strpos

198 PHP equivalents

PHP to Javascript Project: php.js

php.jsThis article is part of the 'Porting PHP to Javascript' Project, which aims to decrease the gap between developing for PHP & Javascript.

A lot of people are familiar with PHP's functions, and though Javascript functions are often quite similar, some functions may be missing or addressed differently. The Javascript implementations should be as compliant with the PHP versions as possible, a good indication is that the PHP function manual could also apply to the Javascript version.

Porting crucial PHP functions to Javascript can be fun & useful. Currently some PHP functions have been added, but readers are encouraged to contribute and improve functions by adding comments. Eventually the goal is to save all the functions in one php.js file and make it publicly available for your coding pleasure.

If you choose to contribute, let me know how you want to be credited in the function's comments. You may also want to subscribe to RSS so you receive updates whenever new functions are posted.

This is a Javascript version of the PHP function: strpos.

PHP strpos

Description

strpos - Find position of first occurrence of a string

int strpos( string haystack , mixed needle [, int offset] )

Returns the numeric position of the first occurrence of needle in the haystack string.Unlike the strrpos() before PHP 5, this function can take a full string as the needle parameter and the entire string will be used.

Parameters

  • haystack
  • needle

    If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

  • offset

    The optional offset parameter allows you to specify which character in haystack to start searching. The position returned is still relative to the beginning of haystack .

Return Values

Returns the position as an integer. If needle is not found, strpos() will return boolean FALSE.

Warning

This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

See Also

Javascript strpos

Source

This is the main source of the Javascript version of PHP's strpos

function strpos( haystack, needle, offset){
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Onno Marsman    
    // *     example 1: strpos('Kevin van Zonneveld', 'e', 5);
    // *     returns 1: 14
 
    var i = (haystack+'').indexOf( needle, offset ); 
    return i===-1 ? false : i;
}

Examples

Currently there is 1 example

Example 1

This is how you could call strpos()
strpos('Kevin van Zonneveld', 'e', 5);
And that would return
14

More about this Project

Download php.js

To easily include it in your code, every function currently available is stored in

Normal

Namespaced What is 'namespaced?'

To download use Right click, Save Link As
Generally the best way is to use a minified version and gzip it


Credits

Respect & awards go to everybody who has contributed in some way so far:

medalmedalOnno Marsman for contributing to:
 acos, acosh, asin, asinh, atan, atanh, ceil, cos, cosh, decbin, dechex, decoct, exp, floor, fmod, getrandmax, hypot, is_finite, is_infinite, is_nan, lcg_value, log, log10, max, max, min, min, mt_getrandmax, mt_rand, pi, pow, rand, round, sin, sinh, sqrt, tan, tanh, setcookie, preg_quote, addslashes, bin2hex, count_chars, html_entity_decode, htmlentities, htmlspecialchars_decode, levenshtein, ltrim, nl2br, nl2br, ord, parse_str, rtrim, soundex, str_ireplace, str_replace, str_replace, str_rot13, str_split, strcasecmp, strip_tags, stripos, stripslashes, stristr, strlen, strnatcmp, strncasecmp, strpbrk, strpos, strrev, strripos, strrpos, strstr, strtolower, strtoupper, substr, substr_count, trim, ucfirst, ucwords, base64_decode, empty, empty, is_bool, isset, utf8_decode, utf8_encode, utf8_encode
spacemedalMichael White (link) for contributing to:
 array_count_values, get_included_files, include, include_once, require, require_once, md5, number_format, parse_str, printf, sha1, sprintf, str_pad, strnatcmp, http_build_query, floatval, is_object, print_r
spacemedalWaldo Malqui Silva for contributing to:
 array_fill, array_pad, array_product, array_rand, compact, count, range, abs, defined, ip2long, long2ip, implode, strcmp, ucwords
spacemedalJack for contributing to:
 compact, max, min, count_chars, htmlentities, md5, parse_str, soundex, sprintf, str_ireplace, strnatcmp, trim, utf8_encode
spacemedalJonas Raoni Soares Silva (link) for contributing to:
 shuffle, abs, setcookie, number_format, number_format, soundex, str_repeat, str_replace, str_rot13, ucwords, wordwrap, wordwrap
spacemedalPhilip Peterson for contributing to:
 sizeof, log10, round, echo, get_html_translation_table, nl2br, str_replace, strchr, urldecode, urlencode, var_export
spacemedalLegaev Andrey for contributing to:
 end, reset, file, file_get_contents, function_exists, include, include_once, http_build_query, is_array, is_object
spacemedalAtes Goral (link) for contributing to:
 array_change_key_case, array_count_values, array_diff_key, get_class, preg_quote, addslashes, count_chars, str_rot13, stripslashes
spacemedalMartijn Wieringa for contributing to:
 array_shift, array_unshift, str_ireplace, str_split, strcasecmp, stripos, strnatcmp, substr
spacemedalBrett Zamir for contributing to:
 array_fill_keys, array_fill_keys, array_filter, array_merge, array_slice, str_split
spacemedalEnrique Gonzalez for contributing to:
 file_exists, filesize, decbin, decoct, deg2rad, rad2deg
spacemedalNate for contributing to:
 array_merge, array_sum, array_unique, addslashes, echo, strncasecmp
spacemedalPhilippe Baumann for contributing to:
 base_convert, bindec, dechex, hexdec, octdec, empty
spacemedalWebtoolkit.info (link) for contributing to:
 crc32, md5, sha1, utf8_decode, utf8_encode
 
spacemedalCarlos R. L. Rodrigues (link) for contributing to:
 array_chunk, array_unique, date, levenshtein
spacemedalJani Hartikainen for contributing to:
 file, file_exists, file_get_contents, filesize
spacemedalAsh Searle (link) for contributing to:
 basename, printf, sprintf
spacemedalErkekjetter for contributing to:
 ltrim, rtrim, trim
spacemedalGeekFG (link) for contributing to:
 krsort, ksort, time
spacemedalJohnny Mast (link) for contributing to:
 array_walk, array_walk_recursive, create_function
spacemedald3x for contributing to:
 array, explode, unserialize
spacemedalmarrtins for contributing to:
 array_change_key_case, addslashes, stripslashes
spacemedalAJ for contributing to:
 urldecode, urlencode
spacemedalAlex for contributing to:
 strip_tags, is_int
spacemedalAlfonso Jimenez (link) for contributing to:
 array_reduce, strpbrk
spacemedalAman Gupta for contributing to:
 base64_decode, utf8_decode
spacemedalArpad Ray (mailto:arpad@php.net) for contributing to:
 serialize, unserialize
spacemedalKarol Kowalski for contributing to:
 array_reverse, abs
spacemedalMirek Slugen for contributing to:
 htmlspecialchars, htmlspecialchars_decode
spacemedalPaulo Ricardo F. Santos for contributing to:
 chunk_split, sprintf
spacemedalSakimori for contributing to:
 strlen, wordwrap
spacemedalThunder.m for contributing to:
 base64_decode, base64_encode
spacemedalTyler Akins (link) for contributing to:
 base64_decode, base64_encode
spacemedalmdsjack (link) for contributing to:
 include, trim
spacemedal0m3r for contributing to:
 array_diff_assoc
spacemedalAlexander Ermolaev (link) for contributing to:
 trim
spacemedalAllan Jensen (link) for contributing to:
 number_format
spacemedalAndrea Giammarchi (link) for contributing to:
 array_map
spacemedalAndreas for contributing to:
 setcookie
spacemedalAndrej Pavlovic for contributing to:
 serialize
spacemedalAnton Ongson for contributing to:
 str_replace
spacemedalArno for contributing to:
 htmlspecialchars
spacemedalAtli Þór for contributing to:
 nl2br
spacemedalBayron Guevara for contributing to:
 base64_encode
spacemedalBen Bryan for contributing to:
 print_r
spacemedalBenjamin Lupton for contributing to:
 number_format
spacemedalBrad Touesnard for contributing to:
 date
spacemedalCagri Ekin for contributing to:
 parse_str
spacemedalChristian Doebler for contributing to:
 sleep
spacemedalCord for contributing to:
 is_array
spacemedalDavid for contributing to:
 is_numeric
spacemedalDavid James for contributing to:
 get_class
spacemedalDino for contributing to:
 serialize
spacemedalDxGx for contributing to:
 trim
spacemedalFGFEmperor for contributing to:
 mktime
spacemedalFelix Geisendoerfer (link) for contributing to:
 array_key_exists
spacemedalFrancesco for contributing to:
 empty
spacemedalFrancois for contributing to:
 htmlspecialchars_decode
spacemedalFremyCompany for contributing to:
 isset
spacemedalGabriel Paderni for contributing to:
 str_replace
spacemedalHoward Yeend for contributing to:
 number_format
spacemedalJ A R for contributing to:
 end
spacemedalKirk Strobeck for contributing to:
 strlen
spacemedalLH for contributing to:
 empty
spacemedalLeslie Hoare for contributing to:
 rand
spacemedalLincoln Ramsay for contributing to:
 basename
spacemedalLinuxworld for contributing to:
 bin2hex
spacemedalLuke Godfrey for contributing to:
 strip_tags
spacemedalManish for contributing to:
 is_array
spacemedalMarc Palau for contributing to:
 strip_tags
spacemedalMateusz "loonquawl" Zalega for contributing to:
 htmlspecialchars_decode
spacemedalMeEtc (link) for contributing to:
 date
spacemedalMick@el for contributing to:
 stripslashes
spacemedalNathan for contributing to:
 htmlspecialchars
spacemedalNick Callen for contributing to:
 wordwrap
spacemedalNorman "zEh" Fuchs for contributing to:
 utf8_decode
spacemedalOzh for contributing to:
 dirname
spacemedalPedro Tainha (link) for contributing to:
 unserialize
spacemedalPeter-Paul Koch (link) for contributing to:
 date
spacemedalPul for contributing to:
 strip_tags
spacemedalPyerre for contributing to:
 checkdate
spacemedalReverseSyntax for contributing to:
 htmlspecialchars_decode
spacemedalRobin for contributing to:
 is_nan
spacemedalSanjoy Roy for contributing to:
 array_diff
spacemedalSaulo Vallory for contributing to:
 strncasecmp
spacemedalScott Cariss for contributing to:
 htmlspecialchars_decode
spacemedalSimon Willison (link) for contributing to:
 str_replace
spacemedalSlawomir Kaniecki for contributing to:
 htmlspecialchars_decode
spacemedalSteve Clay for contributing to:
 function_exists
spacemedalSteve Hilder for contributing to:
 strcmp
spacemedalSteven Levithan (link) for contributing to:
 trim
spacemedalSubhasis Deb for contributing to:
 array_merge_recursive
spacemedalT.Wild for contributing to:
 substr
spacemedalT0bsn for contributing to:
 crc32
spacemedalThiago Mata (link) for contributing to:
 call_user_func_array
spacemedalTim Wiel for contributing to:
 date
spacemedalTod Gentille for contributing to:
 log10
spacemedalXoraX (link) for contributing to:
 dirname
spacemedalYannoo for contributing to:
 mktime
spacemedalYves Sucaet for contributing to:
 utf8_encode
spacemedalbaris ozdil for contributing to:
 mktime
spacemedalbooeyOH for contributing to:
 preg_quote
spacemedaldjmix for contributing to:
 basename
spacemedaldptr1988 for contributing to:
 unserialize
spacemedalduncan for contributing to:
 array_unique
spacemedalecho is bad for contributing to:
 echo
spacemedalgabriel paderni for contributing to:
 mktime
spacemedalger for contributing to:
 html_entity_decode
spacemedalgorthaur for contributing to:
 strcmp
spacemedalhitwork for contributing to:
 utf8_decode
spacemedaljakes for contributing to:
 mktime
spacemedaljohn (link) for contributing to:
 html_entity_decode
spacemedaljohnrembo for contributing to:
 var_export
spacemedalkenneth for contributing to:
 explode
spacemedalmarc andreu for contributing to:
 html_entity_decode
spacemedalmetjay for contributing to:
 time
spacemedalnobbler for contributing to:
 htmlentities
spacemedalnoname for contributing to:
 get_html_translation_table
spacemedalpenutbutterjelly for contributing to:
 str_ireplace
spacemedalsankai for contributing to:
 array_count_values
spacemedalsowberry for contributing to:
 utf8_encode
spacemedalstensi for contributing to:
 intval

Your name here?

Contributing is as easy as adding a comment with better code, or code for a new function.
Any contribution leading to improvement will directly get your name & link here.


Coming Project features

Project features that we are currently working on:

  • Site. A place for php.js of it's own. You can track our lame attempts at phpjs.org. If there are any CakePHP developers out there who would like to help out, please contact me.
  • Compile. Compile your own php.js version, with only the functions you need. Should generate a hash with which you can retrieve latest versions of your php.js combination.
  • docBlock. Move to docBlock comments for improved compatibility with IDEs.
  • Done - Testsuite. A better test-suite that can be ran locally so developers can easily test before commiting. Also the testing itself should be more thorough.
  • Done - Versioning. Individual functions are versioned, but the entire library should be versioned as well.

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tags: programming, php, javascript
category: Programming - Javascript - PHP equivalents
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Comments

#7. Kevin on 06 October 2008

Member avatar: Kevin@ Onno Marsman: Good job!

#6. Onno Marsman on 04 October 2008

Gravatar.com: Onno MarsmanImproved to accept things other than strings like in PHP, and a little optimiztion in the return line ( I used === instead of >=) 

function strpos( haystack, needle, offset){
    var i = (haystack+'').indexOf( needle, offset ); 
    return i===-1 ? false : i;
}

#5. Kevin on 13 September 2008

Member avatar: Kevin@ steve: Well it would be nice if you can copy-paste generic PHP code into a .JS file, and it still works. Straying from the PHP path, means developers have yet another variable to keep track of.. Does this function behave differently from the original PHP function, just because PHP.JS developers think they're smarter?
So we've chosen to stick with PHP and duplicate all of it's features.. and even flaws.

#4. steve on 09 September 2008

Gravatar.com: steveok, here's where I get real lost. I get the point about trying to port the functions - fine. but strpos()? this function in PHP has a HORRIBLE bug where it sometimes returns an int, and sometimes a boolean, and worse yet if the string you want is at the zero index, what do you test for? In JavaScript, all string objects have a .indexOf() and a .lastIndexOf() function that work (IMHO) better than the PHP one, in fact I've seen many libs mimic the JS behavior in a PHP version of index_of() JS .indexOf() returns the (zero based index as an integer (if found)) else returns the integer -1 (e.g. not found) This works much better as you can have logic like. 

if(someString.indexOf('secretcode')){
  //do your magic
}
if you *need* the offset option, you can accomplish with: 
function index_of(haystack, needle, offset){
  if(offset){
    haystack = haystack.substr(offset);
  }
  return haystack.indexOf(needle);
}
Then again, maybe I'm missing the point of this exercise?

#3. Kevin on 08 September 2008

Member avatar: KevinI would still learn JS if I was you.. Don't miss out on beautiful things like jQuery. PHP.JS is just a tool to smoothen up the edges between client <> server interaction development.

#2. Kirk Strobeck on 06 September 2008

Gravatar.com: Kirk StrobeckThis is great. Just what I needed. This small conversion basically means you don't need to learn JavaScript if you know PHP. Nice.

#1. oooooooooooo on 25 August 2008

Default avatar:ooooooooooooThank you!