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PORandom string avoiding words in array behaving incorrectly
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copied!<p>I found some unexpected behavior in my code, so made two examples to demonstrate what was happening and couldn't figure things out from there. What I found was odd to me, and perhaps I'm missing something.</p> <p><strong>Goal: Create a random string and avoid anything specified in an array.</strong></p> <p>In the examples below, I have two methods of testing this.</p> <p>First I have a function that creates a random string from specified characters ($characters) and then I have an array ($avoid) (here with double letters specified) which then loops and informs you if the code worked and it indeed found what was specified in the array.</p> <p>This seems to work, however then I modified the second function to attempt to generate a new random string if the same trigger happened. This to avoid having a string with anything in the array.</p> <p>This part doesn't seem to work.. I'm not sure how else to modify it from here, but I must be missing something. Running the code works, but it catches some things and misses other times.. which I wouldn't expect from code.</p> <pre><code>function getrandom($loopcount) { $loopcount++; $length = 20; $characters = 'abc'; $string = ''; for ($p = 0; $p < $length; $p++) $string.= $characters[ mt_rand( 0,strlen($characters) ) ]; $avoid = array( 'aa', 'bb', 'cc' ); foreach ($avoid as $word) if ( stripos($string,$word) ) $string = 'Double '.$word.' Detected:'.$string; return '<h1 style="color:blue;">'.$string.'<h1>'; } echo getrandom(0); echo getrandom(0); echo getrandom(0); function getrandom2($loopcount) { $loopcount++; $length = 20; $characters = 'abc'; $string = ''; for ($p = 0; $p < $length; $p++) $string.= $characters[ mt_rand( 0,strlen($characters) ) ]; $avoid = array( 'aa', 'bb', 'cc' ); foreach ($avoid as $word) if ( stripos($string,$word) ) $string = getrandom2($loopcount); return '<h1 style="color:green;">'.$string.'<h1>'; } echo getrandom2(0); echo getrandom2(0); echo getrandom2(0); </code></pre>

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