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POPHP function called twice, funny warning message
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copied!<p><strong>FINAL EDIT: I've summarized and simplified this crazy question into a new question, so we can close this Q or whatever is necessary to mark it resolved. Thanks again!</strong></p> <p><strong>NEW:</strong></p> <p>Can you tell me your opinion of this, and possibly see if you can recreate it:</p> <p>Currently, the $post->post_content variable contains:</p> <pre><code>"before <img src="/path/to/valid_img.gif" /> after" </code></pre> <p>This code placed at the top of the theme header.php...</p> <pre><code>------ Code -------- 1: $str = $post->post_content; 2: assert( isset( $str ) ); 3: assert( is_string( $str ) ); 4: echo $str; 5: $str = 'before <img src="/path/to/nonexistant.gif" /> after'; 6: assert( isset( $str ) ); 7: echo $str; -------------------- </code></pre> <p>Outputs this...</p> <pre><code>------ Output ------ before <img src="/path/to/valid_img.gif" /> after before <img src="/path/to/nonexistant.gif" /> after -------------------- </code></pre> <p>With these warnings...</p> <pre><code>--- PHP Warnings --- PHP Warning: assert() [<a href='function.assert'>function.assert</a>]: Assertion failed in /path/to/header.php on line 2 PHP Warning: assert() [<a href='function.assert'>function.assert</a>]: Assertion failed in /path/to/header.php on line 3 -------------------- </code></pre> <p>Why would line 4 properly echo the $str if assert() fails twice when I KNOW 100% it should succeed?</p> <p>What does a broken image src have to do with setting or unsetting the variable $str? WordPress bug/oddity?</p> <p><strong>Now the crazy part...</strong></p> <p>When lines 5-7 are commented out, thus eliminating the nonexistant.gif, the assert() warning does NOT appear and the output STILL properly produces this...</p> <pre><code>------ Output ------ before <img src="/path/to/valid_img.gif" /> after -------------------- </code></pre> <p>Any chance you can reproduce this and tell me what you think? I'm new to PHP, but I'm pretty sure this is crazyness. :)</p> <p><strong>OLD:</strong></p> <p>I'm relatively new to PHP and I have this code:</p> <pre><code>$str = $post->post_content; // hi -- [hw] -- bye <img src="foobar.png" /> $str = core_wp( 'foo_shortcode', $str ); echo $str; // return $str; produces the same warning message // If there is no echo or return, the warning message is not produced. // The warning disappears when I statically set (as object) the initial $str to // "hi -- [hw] -- bye <img src="foobar.png" />". </code></pre> <p>When I run the above code, it works fine (foo-shortcode is doing it's job). The output is:</p> <pre><code>hi -- Hello World -- bye <img src="foobar.png" /> </code></pre> <p>However I always get this warning message, telling me that foo-shortcode seems to be trying to run itself a second time, except the second time around, $str does not exist.</p> <p>And the catch... I only get this warning message when $str contains an HTML img tag pointing to a non-existant src.</p> <pre><code>PHP Warning: Missing argument 1 for foo_shortcode() in ... </code></pre> <p>And here is core-wp() and foo-shortcode():</p> <pre><code>function core_wp( $function, $a = NULL, $b = NULL ) { $wrap = array ( 'foo_shortcode' => 'foo_shortcode', ); $args = array(); if ( isset( $a ) ) $args[] = $a; if ( isset( $b ) ) $args[] = $b; return call_user_func_array( $wrap[ $function ], $args ); } function foo_shortcode( $content ) { return str_replace( '[hw]', 'Hello World', $content ); } </code></pre> <p>First, why would the code work fine, and then simultaneously seem to try to run itself a second time?</p> <p>And regarding the $str containing an invalid img, I suspect this has something to do with the way WordPress generates $post->post_content.</p> <p>EDIT 1 (Weds, July 22 @ 8:55am)</p> <p>I added error-log() per your instructions like this:</p> <pre><code>error_log( 'done1' ); $str = $post->post_content; error_log( 'done2' ); $str = core_wp( 'foo_shortcode', $str ); error_log( 'done3' ); </code></pre> <p>... and it produced this in my error log:</p> <pre><code>[22-Jul-2009 08:52:49] done1 [22-Jul-2009 08:52:49] done2 [22-Jul-2009 08:52:49] PHP Warning: Missing argument 1 for foo_shortcode() in /home/path/to/header.php on line 23 [22-Jul-2009 08:52:49] done3 </code></pre> <p>... and the output sent to the browser (correctly) was:</p> <pre><code>hi -- Hello World -- bye <img src="foobar.png" /> </code></pre> <p>... but the warning message was still produced.</p> <p>EDIT 2 (Weds, July 22 @ 9:18am)</p> <p>I then tried this assertion:</p> <pre><code>59: $str = $post->post_content; 60: assert( isset( $str ) ); 61: $str = core_wp( 'foo_shortcode', $str ); 62: assert( isset( $str ) ); </code></pre> <p>... and the PHP log shows:</p> <pre><code>[22-Jul-2009 09:16:55] PHP Warning: assert() [<a href='function.assert'>function.assert</a>]: Assertion failed in /home/path/to/header.php on line 60 [22-Jul-2009 09:16:55] PHP Warning: Missing argument 1 for foo_shortcode() in /home/path/to/header.php on line 23 </code></pre> <p>... but again, the output is correct, yet the warning is still issued.</p> <p>It seems to me that PHP is initially not setting $str = $post->post-content, then it runs core-wp( 'foo-shortcode', $str ) and says to itself "oh! I really need to set $str = $post->post-content..." goes back and sets it, and then outputs the correct data.</p>

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