PHP preg_grep function

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preg_grep

(PHP 4, PHP 5)

Returns the array consisting of the elements of the
input array that match the given
pattern.

The pattern to search for, as a string.

The input array.

If set to PREG_GREP_INVERT, this function returns
the elements of the input array that do not match
the given pattern.

Returns an array indexed using the keys from the
input array.

Prior to this version, the returned array was indexed regardless of
the keys of the input array.

If you want to reproduce this old behavior, use
array_values() on the returned array to reindex
the values.

Example 1. preg_grep() example

// return all array elements
// containing floating point numbers
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);