FsseInfo: PHP Debugging

http://uk.php.net/manual/en/function.print-r.php
http://uk.php.net/manual/en/function.var-dump.php
http://uk.php.net/manual/en/function.var-export.php
http://uk.php.net/manual/en/function.debug-print-backtrace.php
http://uk.php.net/manual/en/function.debug-backtrace.php

PHP Debugging

print_r

print_r can print a variable or object
for example

<?php
echo "<pre>" ;
echo print_r ($_SERVER,true) ;
echo "</pre>" ;
?>

prints

Array
(
	[HTTP_USER_AGENT] => Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.0.5) Gecko/20060731 Ubuntu/dapper-security Firefox/1.5.0.5
	[HTTP_ACCEPT] => text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
	[HTTP_ACCEPT_LANGUAGE] => en-gb,en;q=0.5
	[HTTP_ACCEPT_ENCODING] => gzip,deflate
	[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7
)

var_dump

var_dump can dump a variable or object
for example

<?php
echo "<pre>" ;
echo var_dump ($_SERVER) ;
echo "</pre>" ;
?>

dumps

array(33) {
  ["HTTP_USER_AGENT"]=>
  string(105) "Mozilla/5.0 (X11; U; Linux i686; en-GB; rv:1.8.0.5) Gecko/20060731 Ubuntu/dapper-security Firefox/1.5.0.5"
  ["HTTP_ACCEPT"]=>
  string(99) "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"
  ["HTTP_ACCEPT_LANGUAGE"]=>
  string(14) "en-gb,en;q=0.5"
  ["HTTP_ACCEPT_ENCODING"]=>
  string(12) "gzip,deflate"
  ["HTTP_ACCEPT_CHARSET"]=>
  string(30) "ISO-8859-1,utf-8;q=0.7,*;q=0.7"
}

var_export

var_export can export a variable or object as a parsable string
for example

<?php
echo "<pre>" ;
echo var_export ($_SERVER,true) ;
echo "</pre>" ;
?>

or if you are outputting to logfile

$block=explode("\n",var_export($out,true)) ;

foreach ($block as $line) {
	 error_log($line . str_repeat(' ',20);
}

which is really nice because it uses the php magic function

__set_state

to populate class members

array ( 
	  'myitem' =>                   
		 myclass::__set_state(array(    
			'element_id' => 155947,                 
			'error_code' => true,                   
			'error_msg' => '',                    
			'loaded' => true)

PhpError

REFERRERS
PhpFunctions

FsseInfo : PhpDebugging

PHP Debugging

print_r

var_dump

var_export