» Javascript equivalent for PHP's function_exists
134 PHP equivalents
- PHP.JS Licensing
- PHP.JS SVN
- PHP.JS Namespaced
- abs
- addslashes
- array_change_key_case
- array_chunk
- array_combine
- array_count_values
- array_diff
- array_diff_assoc
- array_diff_key
- array_fill
- array_flip
- array_keys
- array_key_exists
- array_map
- array_pad
- array_pop
- array_product
- array_push
- array_rand
- array_reduce
- array_reverse
- array_search
- array_shift
- array_sum
- array_unique
- array_unshift
- array_values
- base64_decode
- base64_encode
- basename
- bin2hex
- call_user_func_array
- checkdate
- chr
- compact
- count
- count_chars
- crc32
- date
- defined
- dirname
- echo
- empty
- end
- explode
- file
- file_get_contents
- floatval
- » function_exists
- get_class
- get_included_files
- htmlentities
- html_entity_decode
- http_build_query
- implode
- include
- include_once
- intval
- in_array
- ip2long
- isset
- is_array
- is_null
- is_numeric
- is_object
- is_string
- join
- levenshtein
- long2ip
- ltrim
- md5
- md5_file
- mktime
- nl2br
- number_format
- ord
- parse_str
- preg_quote
- printf
- print_r
- rand
- range
- require
- require_once
- reset
- round
- rtrim
- serialize
- setcookie
- sha1
- sha1_file
- shuffle
- sizeof
- soundex
- split
- sprintf
- strcasecmp
- strchr
- strcmp
- stripos
- stripslashes
- strip_tags
- stristr
- strlen
- strnatcmp
- strpbrk
- strpos
- strrev
- strripos
- strrpos
- strstr
- strtolower
- strtoupper
- str_ireplace
- str_pad
- str_repeat
- str_replace
- str_rot13
- str_split
- substr
- substr_count
- trim
- ucfirst
- ucwords
- unserialize
- urldecode
- urlencode
- utf8_decode
- utf8_encode
- var_export
- wordwrap
PHP to Javascript Project: php.js
This 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: function_exists.
PHP function_exists
Description
function_exists - Return TRUE if the given function has been defined
bool function_exists( string function_name )
Checks the list of defined functions, both built-in (internal) and user-defined, for function_name.
Parameters
-
function_name
The function name, as a string.
Return Values
Returns TRUE if function_name exists and is a function, FALSE otherwise.
Note: This function will return FALSE
for constructs, such as include_once() and echo().
Javascript function_exists
Source
This is the main source of the Javascript version of PHP's function_exists
function function_exists( function_name ) { // http://kevin.vanzonneveld.net // + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + improved by: Steve Clay // + improved by: Legaev Andrey // * example 1: function_exists('isFinite'); // * returns 1: true if (typeof function_name == 'string'){ return (typeof window[function_name] == 'function'); } else{ return (function_name instanceof Function); } }
Examples
Currently there is 1 example
Example 1
function_exists('isFinite');And that would return
trueMore about this Project
Download php.js
To easily include it in your code, every function currently available is stored in
Normal
- uncompressed source: php.js (147.1kB)
- minified: php.min.js (54.1kB)
- compressed: php.packed.js (39kB)
Namespaced What is 'namespaced?'
- uncompressed source: php.namespaced.js (181.6kB)
- minified: php.namespaced.min.js (54.5kB)
- compressed: php.namespaced.packed.js (39.4kB)
To download use Right click, Save Link As
Generally the best way is to use a minified version and gzip it
Testing the functions
The number of functions is growing fast and so it becomes hard to maintain quality.
To defeat that danger of bad code, syntax errors, etc, I've added a new feature: php.js tester.
It is an automatically generated page that includes ALL functions in your browser, and then extracts specific testing information from each function's comments. This info is then used to run the function, and the return value is compared to a predefined one.
This way code is always checked on syntax errors, and if it doesn't function correctly anymore after an update, we should also be able to detect it more easily.
If you want, go check it out.
Credits
Respect & awards go to everybody who has contributed in some way so far:
![]() ![]() | Michael 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 | |
![]() ![]() | _argos for contributing to: |
| array_fill, array_pad, array_product, array_rand, compact, count, range, abs, defined, ip2long, long2ip, implode, strcmp, ucwords | |
![]() ![]() | Jonas Raoni Soares Silva (link) for contributing to: |
| shuffle, abs, setcookie, number_format, number_format, soundex, str_repeat, str_replace, str_rot13, ucwords, wordwrap, wordwrap | |
![]() ![]() | Legaev Andrey for contributing to: |
| end, reset, file, file_get_contents, function_exists, include, include_once, http_build_query, is_array, is_object | |
![]() ![]() | Ates 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 | |
![]() ![]() | Philip Peterson for contributing to: |
| sizeof, round, echo, nl2br, str_replace, strchr, urldecode, urlencode, var_export | |
![]() ![]() | Martijn Wieringa for contributing to: |
| str_ireplace, str_split, strcasecmp, stripos, strnatcmp, substr | |
![]() ![]() | Webtoolkit.info (link) for contributing to: |
| crc32, md5, sha1, utf8_decode, utf8_encode | |
![]() ![]() | Carlos R. L. Rodrigues (link) for contributing to: |
| array_chunk, array_unique, date, levenshtein | |
![]() ![]() | Ash Searle (link) for contributing to: |
| basename, printf, sprintf | |
![]() ![]() | Erkekjetter for contributing to: |
| ltrim, rtrim, trim | |
![]() ![]() | marrtins for contributing to: |
| array_change_key_case, addslashes, stripslashes | |
![]() ![]() | Alfonso Jimenez (link) for contributing to: |
| array_reduce, strpbrk | |
![]() ![]() | Aman Gupta for contributing to: |
| base64_decode, utf8_decode | |
![]() ![]() | Arpad Ray (mailto:arpad@php.net) for contributing to: |
| serialize, unserialize | |
![]() ![]() | Karol Kowalski for contributing to: |
| array_reverse, abs | |
![]() ![]() | Thunder.m for contributing to: |
| base64_decode, base64_encode | |
![]() ![]() | Tyler Akins (link) for contributing to: |
| base64_decode, base64_encode | |
![]() ![]() | mdsjack (link) for contributing to: |
| include, trim | |
![]() ![]() | Alexander Ermolaev (link) for contributing to: |
| trim | |
![]() ![]() | Allan Jensen (link) for contributing to: |
| number_format | |
![]() ![]() | Andrea Giammarchi (link) for contributing to: |
| array_map | |
![]() ![]() | Bayron Guevara for contributing to: |
| base64_encode | |
![]() ![]() | Benjamin Lupton for contributing to: |
| number_format | |
![]() ![]() | Brad Touesnard for contributing to: |
| date | |
![]() ![]() | Brett Zamir for contributing to: |
| str_split | |
![]() ![]() | Cagri Ekin for contributing to: |
| parse_str | |
![]() ![]() | Cord for contributing to: |
| is_array | |
![]() ![]() | David for contributing to: |
| is_numeric | |
![]() ![]() | David James for contributing to: |
| get_class | |
![]() ![]() | DxGx for contributing to: |
| trim | |
![]() ![]() | FGFEmperor for contributing to: |
| mktime | |
![]() ![]() | Felix Geisendoerfer (link) for contributing to: |
| array_key_exists | |
![]() ![]() | FremyCompany for contributing to: |
| isset | |
![]() ![]() | Gabriel Paderni for contributing to: |
| str_replace | |
![]() ![]() | Leslie Hoare for contributing to: |
| rand | |
![]() ![]() | Lincoln Ramsay for contributing to: |
| basename | |
![]() ![]() | MeEtc (link) for contributing to: |
| date | |
![]() ![]() | Mick@el for contributing to: |
| stripslashes | |
![]() ![]() | Nick Callen for contributing to: |
| wordwrap | |
![]() ![]() | Ozh for contributing to: |
| dirname | |
![]() ![]() | Pedro Tainha (link) for contributing to: |
| unserialize | |
![]() ![]() | Peter-Paul Koch (link) for contributing to: |
| date | |
![]() ![]() | Philippe Baumann for contributing to: |
| empty | |
![]() ![]() | Sakimori for contributing to: |
| strlen | |
![]() ![]() | Sanjoy Roy for contributing to: |
| array_diff | |
![]() ![]() | Simon Willison (link) for contributing to: |
| str_replace | |
![]() ![]() | Steve Clay for contributing to: |
| function_exists | |
![]() ![]() | Steve Hilder for contributing to: |
| strcmp | |
![]() ![]() | Steven Levithan (link) for contributing to: |
| trim | |
![]() ![]() | T0bsn for contributing to: |
| crc32 | |
![]() ![]() | Thiago Mata (link) for contributing to: |
| call_user_func_array | |
![]() ![]() | Tim Wiel for contributing to: |
| date | |
![]() ![]() | XoraX (link) for contributing to: |
| dirname | |
![]() ![]() | baris ozdil for contributing to: |
| mktime | |
![]() ![]() | booeyOH for contributing to: |
| preg_quote | |
![]() ![]() | djmix for contributing to: |
| basename | |
![]() ![]() | duncan for contributing to: |
| array_unique | |
![]() ![]() | echo is bad for contributing to: |
| echo | |
![]() ![]() | gabriel paderni for contributing to: |
| mktime | |
![]() ![]() | ger for contributing to: |
| html_entity_decode | |
![]() ![]() | john (link) for contributing to: |
| html_entity_decode | |
![]() ![]() | kenneth for contributing to: |
| explode | |
![]() ![]() | penutbutterjelly for contributing to: |
| str_ireplace | |
![]() ![]() | stensi 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:
- Versioning. Individual functions are versioned, but the entire library should be versioned as well.
- Light. A lightweight version of php.js should be made available with only common functions in it.
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tags: programming, php, javascript
category: Programming - Javascript - PHP equivalents
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#10. Kevin on 15 January 2008
About the PHP vs JS stuff.. I'm not trying to port or emulate the entire language or control structures of PHP. Indeed I don't see the need because (and this is quite a statement), Javascript seems to have more elegant features in that category anyway.
However in my eyes, PHP does provide a large set of standard functions that make developing very easy, and some of them don't have good standard Javascript implementations, though they often would be great to have client-side.
... [more]
So in this project by also providing the functions separately, I hope to keep people from inventing the wheel and give them a head start.
Thanks for your comment Andrea, well appreciated. And respect for your Overbyte editor & JHP environment. The idea is very interesting, and I can see it's all coded with very high skill.
#9. Andrea Giammarchi on 14 January 2008
Finally, You could use my define function too, that accept only scalar values as PHP and is compatible with IE, FireFox, Safari and Opera (Opera devs will fix soon their const keyword ... I guess ...)
http://webreflection.blogspot.com/2007/10/cow-javascript-define-php-like-function.html
... [more]
However, nice stuff .. not so useful in my mind because of different languages nature (I would like to have JS behaviours in PHP, for example :D) but good luck for the project
#8. Legaev Andrey on 08 January 2008
#7. Kevin on 07 January 2008
#6. Legaev Andrey (aka Andrey) on 07 January 2008
If we pass function_name as String then all ok. But if we pass the link to function (link to Object-function) then
this function returns false. In my opinion in this case this function should return true when first
parameter is instance of Function.
... [more]
function function_exists_new( function_name ) {
if (typeof function_name == \'string\')
return (typeof window[function_name] == \'function\');
else
return (function_name instanceof Function);
}
P.S. Please, change my name to Legaev Andrey <legaev_andrey@mail.ru>. Thanks.
#5. Kevin on 06 January 2008
#4. Cord on 06 January 2008
should be
>>function is_array(a) {
#3. Kevin on 04 January 2008
#2. Andrey on 04 January 2008
Object-function may be defined as not a member of Window object.
#1. Steve Clay on 04 January 2008