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.
print_r() and var_export() will
also show protected and private properties of objects with PHP 5, on the
contrary to var_dump().
Remember that print_r() will move the array
pointer to the end. Use reset() to bring
it back to beginning.
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).
Example 1. return parameter example
<?php
$b = array ('m' => 'monkey', 'foo' => 'bar', 'x' => array ('x', 'y', 'z'));
$results = print_r($b, true); //$results now contains output from print_r
?>
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Note:
If you need to capture the output of print_r() with a
version of PHP prior to 4.3.0, use the
output-control functions.
Note:
Prior to PHP 4.0.4, print_r() will continue forever
if given an array or object that
contains a direct or indirect reference to itself. An example
is print_r($GLOBALS) because
$GLOBALS is itself a global variable that
contains a reference to itself.
See also ob_start(),
var_dump() and
var_export().
