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preg_split
Split string by a regular expression
(PHP 4, PHP 5)
array preg_split ( string pattern, string subject [, int limit [, int flags]] )
Parameters
- pattern
The pattern to search for, as a string.
- subject
The input string.
- limit
If specified, then only substrings up to limit are returned, and if limit is -1, it actually means "no limit", which is useful for specifying the flags.
- flags
flags can be any combination of the following flags (combined with bitwise | operator):
PREG_SPLIT_NO_EMPTY- If this flag is set, only non-empty pieces will be returned by preg_split().
PREG_SPLIT_DELIM_CAPTURE- If this flag is set, parenthesized expression in the delimiter pattern will be captured and returned as well.
PREG_SPLIT_OFFSET_CAPTUREIf this flag is set, for every occurring match the appendant string offset will also be returned. Note that this changes the return value in an array where every element is an array consisting of the matched string at offset
0and its string offset into subject at offset1.
Return Values
Returns an array containing substrings of subject split along boundaries matched by pattern.
ChangeLog
| Version | Description |
|---|---|
| 4.3.0 |
The PREG_SPLIT_OFFSET_CAPTURE was added
|
| 4.0.5 |
The PREG_SPLIT_DELIM_CAPTURE was added
|
| 4.0.0 | The flags parameter was added |
Examples
Example 1732. preg_split() example : Get the parts of a search string
<?php
// split the phrase by any number of commas or space characters,
// which include " ", \r, \t, \n and \f
$keywords = preg_split("/[\s,]+/", "hypertext language, programming");
?>
Example 1733. Splitting a string into component characters
<?php
$str = 'string';
$chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);
?>
Example 1734. Splitting a string into matches and their offsets
<?php
$str = 'hypertext language programming';
$chars = preg_split('/ /', $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
print_r($chars);
?>The above example will output:
Array
(
[0] => Array
(
[0] => hypertext
[1] => 0
)
[1] => Array
(
[0] => language
[1] => 10
)
[2] => Array
(
[0] => programming
[1] => 19
)
)
Notes
If you don't need the power of regular expressions, you can choose faster (albeit simpler) alternatives like explode() or str_split().