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Php print r () function

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(PHP 4 , PHP 5)

print_r --  Prints human-readable information about a variable

Syntax

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.

<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>

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
?>

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().

Php print r Function syntax tag

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Php print r syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.


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