» Javascript equivalent for PHP's is_numeric
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: is_numeric.
PHP is_numeric
Description
is_numeric - Finds whether a variable is a number or a numeric string
bool is_numeric( mixed var )
Finds whether the given variable is numeric. Numeric strings consist of optional sign, any number of digits, optional decimal part and optional exponential part. Thus +0123.45e6 is a valid numeric value. Hexadecimal notation (0xFF) is allowed too but only without sign, decimal and exponential part.
Parameters
-
var
The variable being evaluated.
Return Values
Returns TRUE if var is a number or a numeric string, FALSE otherwise.
See Also
Javascript is_numeric
Source
This is the main source of the Javascript version of PHP's is_numeric
function is_numeric( mixed_var ) { // http://kevin.vanzonneveld.net // + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + improved by: David // * example 1: is_numeric(186.31); // * returns 1: true // * example 2: is_numeric('Kevin van Zonneveld'); // * returns 2: false // * example 3: is_numeric('+186.31e2'); // * returns 3: true return !isNaN( mixed_var ); }
Examples
Currently there are 3 examples
Example 1
is_numeric(186.31);And that would return
trueExample 2
is_numeric('Kevin van Zonneveld');And that would return
falseExample 3
is_numeric('+186.31e2');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 (147kB)
- minified: php.min.js (54kB)
- compressed: php.packed.js (39kB)
Namespaced What is 'namespaced?'
- uncompressed source: php.namespaced.js (181.5kB)
- minified: php.namespaced.min.js (54.4kB)
- 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 | |
![]() ![]() | 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
read: 2,351 times










#6. Kevin on 01 March 2008
#5. Kevin on 01 March 2008
#4. Martijn Wieringa on 01 March 2008
I've been working on a simular project.. Here are some functions i completes so far.
Here's my library (so far)#3. Kevin on 16 January 2008
#2. David on 16 January 2008
is_numeric("+186.31e2");
And that needs to return true.
#1. David on 16 January 2008