array str_split ( string $string [, int $split_length = 1 ] )//Converts a string to an array.//将一个字符串转换为数组。

<?php/** * Created by PhpStorm. * User: zhangrongxiang * Date: 2018/3/7 * Time: 下午10:24 */$str = "hello world";//[0] => h;[1] => e;[2] => l;[3] => l;[4] => o;[5] => ;[6] => w;[7] => o;[8] => r;[9] => l;[10] => dprint_r( str_split( $str ) );/* * [0] => he * [1] => ll * [2] => o * [3] => wo * [4] => rl * [5] => d */print_r( str_split( $str, 2 ) );/* * [0] => hello * [1] => ?worl * [2] => d */print_r( str_split( $str, 5 ) );//PHP Warning: ?str_split(): The length of each segment must be greater than zero in file on line 28//print_r(str_split($str,-5));////////////////////////////////////////////////////////////////////////function str_split_unicode( $str, $l = 0 ) { ???if ( $l > 0 ) { ???????$ret = array(); ???????$len = mb_strlen( $str, "UTF-8" ); ???????for ( $i = 0; $i < $len; $i += $l ) { ???????????$ret[] = mb_substr( $str, $i, $l, "UTF-8" ); ???????} ???????????????return $ret; ???} ???????return preg_split( "//u", $str, - 1, PREG_SPLIT_NO_EMPTY );}//[0] => 一//[1] => 切//[2] => 皆//[3] => 文//[4] => 件print_r( str_split_unicode( "一切皆文件" ) );//[0] => 一切皆//[1] => 文件print_r( str_split_unicode( "一切皆文件", 3 ) );//[0] => 一?//[1] => ???//[2] => ?文//[3] => 件print_r( str_split( "一切皆文件", 4 ) );////////////////////////////////////////////////////////////////$spl1 = str_split( "Long" );echo count( $spl1 ) . PHP_EOL; // 4//[0] => L//[1] => o//[2] => n//[3] => gprint_r( $spl1 );$spl2 = str_split( "X" );//1echo count( $spl2 ) . PHP_EOL;//[0] => Xprint_r( $spl2 );$spl3 = str_split( "" );echo count( $spl3 ) . PHP_EOL;//1//[0] =>print_r( $spl3 );$spl4 = str_split( 23 );echo count( $spl4 ) . PHP_EOL;//2//[0] => 2//[1] => 3print_r( $spl4 );$spl5 = str_split( 2.3 );echo count( $spl5 ) . PHP_EOL;//3//[0] => 2//[1] => .//[2] => 3print_r( $spl5 );$spl6 = str_split( true );echo count( $spl6 ) . PHP_EOL;//1//[0] => 1print_r( $spl6 );$spl7 = str_split( null );echo count( $spl7 ) . PHP_EOL;//1//[0] =>print_r( $spl7 );