phpjs/_octopress/source/functions/call_user_func_array/_comments.html

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<strong>
legatee322
</strong>
on 2012-08-04 07:10:30 <br />

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<strong>
<a href="http://brett-zamir.me" rel="nofollow">Brett Zamir</a>
</strong>
on 2010-04-28 18:41:56 <br />
@Diplom@t : Very helpful patch, thank you. I've simplified a bit using the conditional operator and applied against the object when the object is specified as a string (in an array). Feel free to review the changes at http://github.com/kvz/phpjs/raw/master/functions/funchand/call_user_func_array.js and http://github.com/kvz/phpjs/raw/master/functions/funchand/call_user_func.js
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<strong>
<a href="difane.com" rel="nofollow">Diplom@t</a>
</strong>
on 2010-04-28 13:54:02 <br />
Function didn't work for me when i've tried to call it like:
var ma = new A();
call_ser_func_array( array(ma, &quot;foo&quot;), [x] );
An error was thrown:
&quot;Syntax error: Missing ] after element list&quot; pointing on the line with eval.

I have modified the function like one below and it works now:
    
    var func;

    if (typeof cb == 'string') {
        if (typeof this[cb] == 'function') {
            func = this[cb];
        } else {
            func = (new Function(null, 'return ' + cb))();
        }
    } else if (cb instanceof Array) {
        if ( typeof cb[0] == 'string' ) {
            func = eval(cb[0]+&quot;['&quot;+cb[1]+&quot;']&quot;);
        } else {
            func = cb[0][cb[1]];
        }
    }
    
    if (typeof func != 'function') {
        throw new Error(func + ' is not a valid function');
    }

    if ( typeof cb[0] == 'string' ) {
      return func.apply(null, parameters);
    } else {
      return func.apply(cb[0], parameters);
    }
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<strong>
<a href="http://kevin.vanzonneveld.net" rel="nofollow">Kevin van Zonneveld</a>
</strong>
on 2008-12-30 10:58:07 <br />
@ Brett Zamir: Yes eval is evil so we'll try to minimize it's use as much as possible, I've made some minor adjustments, let me know if it's ok.
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<strong>
<a href="http://bahai-library.com" rel="nofollow">Brett Zamir</a>
</strong>
on 2008-12-20 11:49:24 <br />
Hi,

First, here's a revision. I have a number of differences in mine, some perhaps for better or worse.

1) I can't see any need for the check &amp;quot;if (typeof this[func] == 'function') {&amp;quot;
2) Although 'eval' is not in vogue, I know, the Function constructor is also subject to eval() issues too, so I just used eval().
3) I didn't see any need for &amp;quot;throw new Exception(func + ' is not a valid function');&amp;quot; in the code posted here, since it would already be a function.
4) I allowed a PHP-style array to be given as the callback to supply a object+method (as in the call_user_func() PHP documentation)

<pre><code>function call_user_func_array (cb, arr) {
    if (typeof cb === 'string') {
        cb = eval(cb);
    }
    else if (cb instanceof Array) {
        cb = eval(cb[0]+&amp;quot;['&amp;quot;+cb[1]+&amp;quot;']&amp;quot;);
    }
    cb.apply(null, arr);
}</code></pre>

And then, here's a new one, call_user_func():

<pre><code>function call_user_func (cb) {
    if (typeof cb === 'string') {
        cb = eval(cb);
    }
    else if (cb instanceof Array) {
        cb = eval(cb[0]+&amp;quot;['&amp;quot;+cb[1]+&amp;quot;']&amp;quot;);
    }
    cb.apply(null, Array.prototype.slice.call(arguments, 1));
}</code></pre>

Works with objects, and regular functions, whether as strings, arrays, or functions.
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<strong>
<a href="http://kevin.vanzonneveld.net" rel="nofollow">Kevin van Zonneveld</a>
</strong>
on 2008-08-27 17:06:10 <br />
@ Jon Hohle: Very good work Jon Hohle! Your version will be included!
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<strong>
Jon Hohle
</strong>
on 2008-08-05 15:32:26 <br />
Here is a cleaner version of call_user_func_array which uses Function:apply. It takes string arg functions or function objects. Because of scoping issues, however, this may behave differently then the method posted above:

call_user_func_array = function(func, parameters) {
    if (typeof func == 'string') {
        if (typeof this[func] == 'function') { func = this[func]; }
        else {
            func = (new Function(null, 'return ' + func))();
        }
        if (typeof func != 'function') {
            throw new Exception(func + ' is not a valid function');
        }
    }
    return func.apply(null, parameters);
}
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