If anyone's trying to actually set up the official debugger from Zend (http://www.zend.com/en/products/studio/downloads) with PHP 5.3.8, you'll notice the zip only contains the nts (non-thread-safe) version of the debugger for PHP 5.3.x. Try as you might, it just doesn't seem to work with the tread-safe version of PHP 5.3.8, so for Windows at least I found you'll also need to have the NON-THREAD-SAFE version of PHP installed.
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User Contributed Notes 5 notes
Anonymous ¶
2 years ago
dcz at phpbb-seo dot com ¶
2 years ago
Here my little contribution for a simple yet handy debug function :
<?php
/**
* dbug (mixed $expression [, mixed $expression [, $... ]])
* Author : dcz
* Feel free to use as you wish at your own risk ;-)
*/
function dbug() {
static $output = '', $doc_root;
$args = func_get_args();
if (!empty($args) && $args[0] === 'print') {
$_output = $output;
$output = '';
return $_output;
}
// do not repeat the obvious (matter of taste)
if (!isset($doc_root)) {
$doc_root = str_replace('\\', '/', $_SERVER['DOCUMENT_ROOT']);
}
$backtrace = debug_backtrace();
// you may want not to htmlspecialchars here
$line = htmlspecialchars($backtrace[0]['line']);
$file = htmlspecialchars(str_replace(array('\\', $doc_root), array('/', ''), $backtrace[0]['file']));
$class = !empty($backtrace[1]['class']) ? htmlspecialchars($backtrace[1]['class']) . '::' : '';
$function = !empty($backtrace[1]['function']) ? htmlspecialchars($backtrace[1]['function']) . '() ' : '';
$output .= "<b>$class$function =>$file #$line</b><pre>";
ob_start();
foreach ($args as $arg) {
var_dump($arg);
}
$output .= htmlspecialchars(ob_get_contents(), ENT_COMPAT, 'UTF-8');
ob_end_clean();
$output .= '</pre>';
}
?>
usage :
<?php
dbug($scalar, $array, $object, $resource, CONSTANT);
//..
dbug($other);
//..
echo dbug('print'); // actually output the result of all previous calls
// looks like :
// class::method() =>/path/from/doc/root/file.php #line
// var_dump result
?>
I found it handy not to directly output result data because this makes it possible to debug variables before headers are sent (useful for pre sessions start code for example).
Diego ¶
4 years ago
If you don't find a syntax error, you can comment out a block where you assume the error (or put it out of the document by [ctrl] + [X], but keep a copy on your HD for the case, your computer crashes) and check, if the syntax error is still there.
If not, it must be anywhere in your commented text; if yes, it must be somewhere else.
If you want to locate the error better, do it again with an other and/or smaller piece of code, till you get it.
online _ use _ only == hotmail.com ¶
7 years ago
I still find that printing out variable values at problem points in the code is one of the easiest ways for me to debug. If you're interested in knowing the full contents of an object/array/scalar, then use
var_dump($var).
turaz dot w4l at gmail dot com ¶
4 years ago
I usually use this simple function in combo with a die(); in order to have on screen the value of a variable or array:
<?php
function debug_view ( $what ) {
echo '<pre>';
if ( is_array( $what ) ) {
print_r ( $what );
} else {
var_dump ( $what );
}
echo '</pre>';
}
?>