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PHP Functions Online


print_r

(PHP 4, PHP 5)

print_r Prints human-readable information about a variable

mixed print_r(mixed $expression[, bool $return = false])

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Description #

mixed print_r ( mixed $expression [, bool $return = false ] )

print_r() displays information about a variable in a way that's readable by humans.

print_r(), var_dump() and var_export() will also show protected and private properties of objects with PHP 5. Static class members will not be shown.

Parameters #

expression

The expression to be printed.

return

If you would like to capture the output of print_r(), use the return parameter. When this parameter is set to TRUE, print_r() will return the information rather than print it.

Return Values #

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.

Examples #

Example #1 print_r() example

<pre>
<?php
$a 
= array ('a' => 'apple''b' => 'banana''c' => array ('x''y''z'));
print_r ($a);
?>
</pre>

The above example will output:

<pre>
Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)
</pre>

Changelog #

Version Description
4.3.0 The return parameter was added. If you need to capture the output of print_r() with an older version of PHP prior, use the output-control functions.
4.0.4 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.

Notes #

Note:

When the return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start() callback function.

See Also #