print_r

(PHP 4 )

print_r --  Prints human-readable information about a variable

Description

bool print_r ( mixed expression)

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.

Подсказка: Как и с любой другой функцией, осуществляющей вывод непосредственно в броузер, вы можете использовать функции контроля вывода, чтобы перехватывать выводимые этой функцией данные и сохранять их, например, в строковой переменной.

<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>

Замечание: 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().