PHP strtok()函数的优点分析_PHP
Jun 01, 2016 pm 12:20 PM
php
strtok
其优点是:
1、可以一次定义多个分隔符。函数在执行时,是按单个分隔符来切割,而不是按整个分隔符,而explode则是按整个分隔串来切割的。正因此,explode可以用中文切割,而strtok则不行,会乱码。
2、在使用while或for配合strtok()遍历时,可以随时更换分隔符,也可以随时用break跳出终止切割。
示例1:演示用中文+explode来切割
$string = "这是PHP论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员"; $arr = explode("论坛",$string); foreach($arr as $v) { echo $v." "; } echo "------------- "; |
返回:
这是PHP 版块 栏目 H管理员 会员 ------------- |
示例2:演示更换切割符,注意后面WHILE中不再带有“H”分隔符。而只是用空格。
$string = "这是PHP论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员"; $tok = strtok($string, " H"); //空格+H $n=1; while ($tok !== false) { echo "$tok "; $tok = strtok(" "); //空格 //if($n>2)break; //可以随时跳出。 //$n++; } echo "------------- "; |
返回:
这是P P论坛 论坛版块 论坛栏目 论坛H管理员 论坛会员 ------------- |
示例3:演示多分隔符。
$string = "This is\tan example\nstring"; $tok = strtok($string, " \n\t"); #空格,换行,TAB while ($tok !== false) { echo "$tok "; $tok = strtok(" \n\t"); } echo "------------- "; |
返回:
This is an example string ------------- |
$string = "abcde 123c4 99sadbc99b5232"; $tok = strtok($string, "bc"); while ($tok !="") { echo "$tok "; $tok = strtok("bc"); } echo "------------- "; |
返回:
a de 123 4 99sad 99 5232 ------------- |
示例4:演示用for来遍历:
$line = "leon\tatkinson\tleon@clearink.com"; for($token = strtok($line,"\t");$token!="";$token=strtok("\t")) { print("token: $token \n"); } |
返回:
token: leon token: atkinson token: leon@clearink.com |
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