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PHP missing array grandchild

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Posted : Friday, 23 September 2011, 04:37 | Permalink | Mark Here
HoboBen WW Entries : 9	I have some code for building a HTML table from PHP. <?php function new_table($class) { $table = array('class' => $class, 'tr' => array()); return $table; } function new_tr(&$table, $class) { $tr = array('class' => $class, 'td' => array()); $table['tr'][] = $tr; return $tr; } function new_td(&$tr, $class, $content) { $td = array('class' => $class, 'content' => $content); $tr['td'][] = $td; return $td; } ?> --> Usage: $table = new_table('admin whoami'); $tr = new_tr($table, 'head'); new_td($tr, 'field', 'Field'); new_td($tr, 'value', 'Value'); $tr = new_tr($table, 'body'); new_td($tr, 'field', 'Name'); new_td($tr, 'value', $my_name); echo '--- tr ---'.chr(10); var_dump($tr); echo '--- table ---'.chr(10); var_dump($table); --> And the result: --- tr --- array(2) { ["class"]=> string(4) "body" ["td"]=> array(2) { [0]=> array(2) { ["class"]=> string(5) "field" ["content"]=> string(4) "Name" } [1]=> array(2) { ["class"]=> string(5) "value" ["content"]=> string(5) "user0" } } } --- table --- array(2) { ["class"]=> string(12) "admin whoami" ["tr"]=> array(2) { [0]=> array(2) { ["class"]=> string(4) "head" ["td"]=> array(0) { } } [1]=> array(2) { ["class"]=> string(4) "body" ["td"]=> array(0) { } } } } --> If you note, var_dump($tr) correctly dumps the <tr>, including child <td> elements. However, var_dump($table), while correctly var_dumping the <tr> elements, does not var_dump the grandchild <td> elements -- note the empty array ["td"]=> array(0) { } Do you know why this might be happening? Thanks ----- github
Posted : Saturday, 24 September 2011, 04:29 | Permalink | Mark Here
HoboBen WW Entries : 9	I got an excellent answer on StackOverflow, which explains the problem. Sigh, why can't everything use C-style pointers? I hate it when PHP does "magic". ----- github
Posted : Sunday, 25 September 2011, 03:19 | Permalink | Mark Here
JL235 WW Entries : 7	What version of PHP are you using? It's my understanding that PHP uses references instead of copying in recent versions (at least in 5.3). ----- PlayMyCode.com - build and play in your browser, Blog, Twitter.
Posted : Sunday, 25 September 2011, 12:32 | Permalink | Mark Here
HoboBen WW Entries : 9	5.3.3 on my laptop (where I ran the code) slightly older on the server. ben@debian6400:~$ php --version PHP 5.3.3-7+squeeze3 with Suhosin-Patch (cli) (built: Jun 28 2011 13:13:26) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH --> It was a great answer though: the ampersand in the function definition was something I didn't know how to do in PHP. It solved the immediate problem and also taught me how to apply this to other situations. ----- github