print_r
Description
bool print_r ( mixed expression [, bool return])Note: The return parameter was added in PHP 4.3.0
print_r() displays information about a variable in a way that's readable by humans. If given a string, integer or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects.
Remember that print_r() will move the array pointer to the end. Use reset() to bring it back to beginning.
<pre>
<?php
$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x','y','z'));
print_r ($a);
?>
</pre> |
Which will output:
<pre>
Array
(
[a] => apple
[b] => banana
[c] => Array
(
[0] => x
[1] => y
[2] => z
)
)
</pre> |
If you would like to capture the output of print_r(), use the return parameter. If this parameter is set to TRUE, print_r() will return its output, instead of printing it (which it does by default).
Note: If you need to capture the output of print_r() with a version of PHP prior to 4.3.0, use the output-control functions.
Note: Prior to PHP 4.0.4, print_r() will continue forever if given an array or object that contains a direct or indirect reference to itself. An example is print_r($GLOBALS) because $GLOBALS is itself a global variable that contains a reference to itself.
See also ob_start(), var_dump() and var_export().