PYTHON in_array

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Python replacement for PHP's in_array [ edit | history ] 
needle in haystack

# example
haystack = [1,5,6,3]
needle = 6
if needle in haystack:
    print 'needle found'

PHP in_array

PHP original manual for in_array [ show | php.net ]

in_array

(PHP 4, PHP 5)

in_array — Checks if a value exists in an array

Description

bool in_array ( mixed $needle , array $haystack [, bool $strict ] )

Searches haystack for needle .

Parameters

needle

The searched value.

Note: If needle is a string, the comparison is done in a case-sensitive manner.

haystack

The array.

strict

If the third parameter strict is set to TRUE then the in_array() function will also check the types of the needle in the haystack .

Return Values

Returns TRUE if needle is found in the array, FALSE otherwise.

Changelog

Version Description
4.2.0 needle may now be an array.

Examples

Example #1 in_array() example

<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
    echo "Got Irix";
}
if (in_array("mac", $os)) {
    echo "Got mac";
}
?>

The second condition fails because in_array() is case-sensitive, so the program above will display: 

Got Irix

Example #2 in_array() with strict example

<?php
$a = array('1.10', 12.4, 1.13);

if (in_array('12.4', $a, true)) {
    echo "'12.4' found with strict check\n";
}

if (in_array(1.13, $a, true)) {
    echo "1.13 found with strict check\n";
}
?>

The above example will output:

1.13 found with strict check

Example #3 in_array() with an array as needle

<?php
$a = array(array('p', 'h'), array('p', 'r'), 'o');

if (in_array(array('p', 'h'), $a)) {
    echo "'ph' was found\n";
}

if (in_array(array('f', 'i'), $a)) {
    echo "'fi' was found\n";
}

if (in_array('o', $a)) {
    echo "'o' was found\n";
}
?>

The above example will output:

  'ph' was found
  'o' was found

See Also

  • array_search() - Searches the array for a given value and returns the corresponding key if successful
  • isset() - Determine whether a variable is set
  • array_key_exists() - Checks if the given key or index exists in the array

Array Functions
PHP Manual