09-23-2004
I'm not going to explain every line. Most of it is straightforward. What is it you don't understand? The arrays? Do you know what an array is?
One thing: ${#array[@]} is the number of elements in the array.
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LEARN ABOUT PHP
array_intersect
ARRAY_INTERSECT(3) 1 ARRAY_INTERSECT(3)
array_intersect - Computes the intersection of arrays
SYNOPSIS
array array_intersect (array $array1, array $array2, [array $...])
DESCRIPTION
array_intersect(3) returns an array containing all the values of $array1 that are present in all the arguments. Note that keys are pre-
served.
PARAMETERS
o $array1
- The array with master values to check.
o $array2
- An array to compare values against.
o $...
- A variable list of arrays to compare.
RETURN VALUES
Returns an array containing all of the values in $array1 whose values exist in all of the parameters.
EXAMPLES
Example #1
array_intersect(3) example
<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>
The above example will output:
Array
(
[a] => green
[0] => red
)
NOTES
Note
Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is
the same.
SEE ALSO
array_intersect_assoc(3), array_diff(3), array_diff_assoc(3).
PHP Documentation Group ARRAY_INTERSECT(3)