php分割字符串的函数是什么

array explode( string separator, string string [, int limit] )

<?php
$str = 'one|two|three|four';
print_r(explode('|', $str));
print_r(explode('|', $str, 2));
// 负数的 limit（自 PHP 5.1 起）
print_r(explode('|', $str, -1));
?>

Array
(
 [0] => one
 [1] => two
 [2] => three
 [3] => four
)
Array
(
 [0] => one
 [1] => two|three|four
)
Array
(
 [0] => one
 [1] => two
 [2] => three
)

array str_split( string string [, int length] )

<?php
$str = 'one two three';
$arr1 = str_split($str);
$arr2 = str_split($str, 3);
print_r($arr1);
print_r($arr2);
?>

Array
(
 [0] => o
 [1] => n
 [2] => e
 [3] => 
 [4] => t
 [5] => w
 [6] => o
 [7] => 
 [8] => t
 [9] => h
 [10] => r
 [11] => e
 [12] => e
)
Array
(
 [0] => one
 [1] => tw
 [2] => o t
 [3] => hre
 [4] => e
)