Performing a Function on Each Element of an Array

Is array_walk() the way to go?

[Nick_W]

Hi all,

I have (PHP) an multi-dimensional array of values pulled from a database.

If I want to stripslashes() from each element of the array, is array_walk() the way forward, or is there a better way...?

Many thanks...

Nick

[DrDoc]

Hello Nick.

From the PHP documentation on array_walk() [php.net]

array_walk -- Apply a user function to every member of an array

Seems like that would be the way to go :)

Of course, there are other ways too. If you want to iterate through the array until you find a match, well, then it's better to use a function where you have more control over the process (such as while() [php.net] or for() [php.net])

foreach() [php.net] is also a possible solution.

[andreasfriedrich]

Note however, that array_walk [php.net] will not walk through your multidimensional array recursively.

function mycb(&$item, $key) { 
 $item = "->".$item; 
} 
# 
$t['aaron'] = array('carter', 15); 
$t['jesse'] = array('mccartney', 16); 
# 
array_walk [php.net]($t, 'mycb'); 
# 
echo [php.net] "<pre>", print_r [php.net]($t), "</pre>"; 

will print

Array 
( 
 [aaron] => ->Array 
 [jesse] => ->Array 
) 

To get the expected behaviour you need to check whether $item is_array [php.net] is true and call array_walk [php.net] for that array as well. So your callback function would need to look like this:

function mycb(&$item, $key) { 
 echo [php.net] $item; 
 if(is_array [php.net]($item)) { 
 array_walk [php.net]($item, 'mycb'); 
 return; 
 } 
 $item = "->".$item; 
} 

Andreas