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Руководство по PHP
Пред. След.

split

(PHP 3, PHP 4, PHP 5)

split -- Split string into array by regular expression

Description

array split ( string pattern, string string [, int limit] )

Подсказка: preg_split(), which uses a Perl-compatible regular expression syntax, is often a faster alternative to split(). If you don't require the power of regular expressions, it is faster to use explode(), which doesn't incur the overhead of the regular expression engine.

Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the case-sensitive regular expression pattern. If limit is set, the returned array will contain a maximum of limit elements with the last element containing the whole rest of string. If an error occurs, split() returns FALSE.

To split off the first four fields from a line from /etc/passwd:

Пример 1. split() example

<?php
list($user, $pass, $uid, $gid, $extra) =
    
split(":", $passwd_line, 5);
?>

If there are n occurrences of pattern, the returned array will contain n+1 items. For example, if there is no occurrence of pattern, an array with only one element will be returned. Of course, this is also true if string is empty.

To parse a date which may be delimited with slashes, dots, or hyphens:

Пример 2. split() example

<?php
// Delimiters may be slash, dot, or hyphen
$date = "04/30/1973";
list(
$month, $day, $year) = split('[/.-]', $date);
echo
"Month: $month; Day: $day; Year: $year<br />\n";
?>

For users looking for a way to emulate Perl's @chars = split('', $str) behaviour, please see the examples for preg_split().

Please note that pattern is a regular expression. If you want to split on any of the characters which are considered special by regular expressions, you'll need to escape them first. If you think split() (or any other regex function, for that matter) is doing something weird, please read the file regex.7, included in the regex/ subdirectory of the PHP distribution. It's in manpage format, so you'll want to do something along the lines of man /usr/local/src/regex/regex.7 in order to read it.

See also: preg_split(), spliti(), explode(), implode(), chunk_split(), and wordwrap().



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