Use PHP functions in JavaScript

JavaScript compact

Creates a hash containing variables and their values

function compact ( ) {
    // Creates a hash containing variables and their values  
    // 
    // version: 909.322
    // discuss at: http://phpjs.org/functions/compact    // +   original by: Waldo Malqui Silva
    // +    tweaked by: Jack
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: var1 = 'Kevin'; var2 = 'van'; var3 = 'Zonneveld';      // *     example 1: compact('var1', 'var2', 'var3');
    // *     returns 1: {'var1': 'Kevin', 'var2': 'van', 'var3': 'Zonneveld'}    
    
    var matrix = {}, that = this;
     var process = function ( value ) {
        var i = 0, l = value.length, key_value = '';
        for (i = 0; i < l; i++) {
            key_value = value [ i ];
            if (key_value instanceof Array) {                process( key_value );
            } else {
                if (typeof that.window[key_value] !== 'undefined') {
                    matrix[key_value] = that.window[key_value];
                }            }
        }
        return true;
    };
        process(arguments);
    return matrix;
}

external links: original PHP docs | raw js source

Examples

Running

1 2	var1 = 'Kevin'; var2 = 'van'; var3 = 'Zonneveld'; compact('var1', 'var2', 'var3');

Should return

1	{'var1': 'Kevin', 'var2': 'van', 'var3': 'Zonneveld'}

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 compact goodness in JavaScript.

Waldo Malqui Silva ( original )
Jack ( tweaked )
Brett Zamir ( input )
Kevin van Zonneveld ( bugfixed )

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
3 Dec '08

Again, adapting the PHP manual's examples, here is an equivalent for extract():

var size = &quot;large&quot;;
var var_array = {&quot;color&quot; : &quot;blue&quot;,
                   &quot;size&quot; : &quot;medium&quot;,
                   &quot;shape&quot; : &quot;sphere&quot;};
extract(var_array, 'EXTR_PREFIX_SAME', &quot;wddx&quot;); 
alert([color, size, shape, wddx_size].join()); // blue,large,sphere,medium

// Only works on global variables
 
function extract (arr, type, prefix) {
    for (var i in arr) {
        switch (type) {            case 'EXTR_PREFIX_SAME' || 2:
                if (window[i] !== undefined) {
                   window[prefix+'_'+i] = arr[i];
               }
               // Fall-through            case 'EXTR_SKIP' || 1:
               if (window[i] === undefined) {
                   window[i] = arr[i];
               }
               break;            case 'EXTR_PREFIX_ALL' || 3:
               window[prefix+'_'+i] = arr[i];
               break;
            case 'EXTR_PREFIX_INVALID' || 4:
               if(i.match(/^[_a-zA-Z$][\w|$]*$/) != null) { // Refine regexp to allow JS 1.5+ Unicode identifiers                   window[i] = arr[i];
               }
               else {
                   window[prefix+'_'+i] = arr[i];
               }               break;
            case 'EXTR_IF_EXISTS' || 6:
               if (window[i] !== undefined) {
                   window[i] = arr[i];
               }               break;
            case 'EXTR_PREFIX_IF_EXISTS' || 5:
               if (window[i] !== undefined) {
                   window[prefix+'_'+i] = arr[i];
               }               break;
            case 'EXTR_REFS' || 256:
               throw 'The EXTR_REFS type will not work in JavaScript';
               break;
            case 'EXTR_OVERWRITE' || 0:                // Fall-through
            default:
                window[i] = arr[i];
                break;
          }    }
}

Karol Kowalski
6 Feb '08

This version is not recursive as it should be acc to the php manual. Try run following example (taken from the manual, too):

var city  = &quot;San Francisco&quot;;
var state = &quot;CA&quot;;
var event = &quot;SIGGRAPH&quot;;
 
var location_vars = new Array(&quot;city&quot;, &quot;state&quot;); 
var result = compact(&quot;event&quot;, &quot;nothing_here&quot;, &quot;location_vars&quot;);
 
console.log(result)

What you get is an object with event property and location_vars property which is an Array. What should be returned is a 'flat' object with event, city and state properties (because location_vars) should be searched inside.

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