Use PHP functions in JavaScript

JavaScript array_keys

Return just the keys from the input array, optionally only for the specified search_value

function array_keys (input, search_value, argStrict) {
    // Return just the keys from the input array, optionally only for the specified search_value  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/array_keys    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: array_keys( {firstname: 'Kevin', surname: 'van Zonneveld'} );
    // *     returns 1: {0: 'firstname', 1: 'surname'}    
    var tmp_arr = {}, strict = !!argStrict, include = true, cnt = 0;
    var key = '';
    
    for (key in input) {        include = true;
        if (search_value != undefined) {
            if (strict && input[key] !== search_value){
                include = false;
            } else if (input[key] != search_value){                include = false;
            }
        }
        
        if (include) {            tmp_arr[cnt] = key;
            cnt++;
        }
    }
        return tmp_arr;
}

external links: original PHP docs | raw js source

Examples

Running

1	array_keys( {firstname: 'Kevin', surname: 'van Zonneveld'} );

Should return

1	{0: 'firstname', 1: 'surname'}

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have array_keys goodness in JavaScript.

Kevin van Zonneveld ( original bugfixed )
Brett Zamir ( input )

Comments

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Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Brett Zamir
Jan 12th

Hello Mickael,

This should definitely be working in Firefox, as that is what i use to test it. Can you please give example code which causes the problem for you? Are you using any other libraries with your code like Prototype?

Mickael
Jan 12th

Hi,
I test this function with Mozilla Firefox 3.5.7 but it does not work.
I think that Mozilla has a bug concerning "for in" syntax.

Thanks for all scripts, PHP.JS is a very good work :)

Kevin van Zonneveld
22 Jan '08

@ Ates Goral: Nice work, added!

Ates Goral
22 Jan '08

Hmmm. I should change that to:

1 2	const CASE_LOWER = 0; const CASE_UPPER = 1;

Ates Goral
22 Jan '08

Hey Kevin, here's my implementation for array_change_key_case().

var CASE_LOWER = 0;
var CASE_UPPER = 1;
 
function array_change_key_case(array) {
    // *     example 1: array_change_key_case(42);    // *     returns 1: false
    // *     example 2: array_change_key_case([ 3, 5 ]);
    // *     returns 2: {0: 3, 1: 5}
    // *     example 3: array_change_key_case({ FuBaR: 42 });
    // *     returns 3: {&quot;fubar&quot;: 42}    // *     example 4: array_change_key_case({ FuBaR: 42 }, CASE_LOWER);
    // *     returns 4: {&quot;fubar&quot;: 42}
    // *     example 5: array_change_key_case({ FuBaR: 42 }, CASE_UPPER);
    // *     returns 5: {&quot;FUBAR&quot;: 42}
    // *     example 6: array_change_key_case({ FuBaR: 42 }, 2);    // *     returns 6: {&quot;FUBAR&quot;: 42}
    
    if (array instanceof Array) {
        return array;
    }    
    if (array instanceof Object) {
        var case_fn = (arguments.length == 1 || arguments[1] == CASE_LOWER) ?
                &quot;toLowerCase&quot; : &quot;toUpperCase&quot;;
        var ret = new Object();        
        for (var key in array) {
            ret[key[case_fn]()] = array[key];    
        }
                return ret;
    }
    
    return false;
}