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详解PHP处理字符串类似indexof的方法函数

Jun 06, 2016 pm 08:06 PM

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详解PHP处理字符串类似indexof的方法函数

在PHP中处理字符串类似 indexof 的函数或方法有两个,它们是 strpos 函数和 stripos 函数,这两个函数的用法类似。

strpos 函数处理字符串时如果包含该字符串,则返回该字符串出现的第一次出现的位置,如果没有出现则返回 false。对字符串大小写敏感。

stripos 函数处理字符串时如果包含该字符串,则返回该字符串出现的第一次出现的位置,如果没有出现则返回 false。对字符串大小写不敏感。

PHP strpos() 函数

定义和用法

strpos() 函数查找字符串在另一字符串中第一次出现的位置。

注释:strpos() 函数对大小写敏感。

注释:该函数是二进制安全的。

语法

strpos(string, find, start)
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参数描述

string:必需。规定要搜索的字符串。
find:必需。规定要查找的字符串。
start:可选。规定开始搜索的位置。

返回值

返回字符串在另一字符串中第一次出现的位置,如果没有找到字符串则返回 FALSE。

注释:字符串位置从 0 开始,不是从 1 开始。

例子

<?php
echo strpos(&#39;Hello world!&#39;, &#39;wo&#39;);
?>
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输出:6

PHP stripos() 函数

定义和用法

stripos() 函数查找字符串在另一字符串中第一次出现的位置。

注释:stripos() 函数是不区分大小写的。

注释:该函数是二进制安全的。

语法

stripos(string,find,start)
Copy after login

参数描述

string:必需。规定要搜索的字符串。
find:必需。规定要查找的字符串。
start:可选。规定开始搜索的位置。

返回值

返回字符串在另一字符串中第一次出现的位置,如果没有找到字符串则返回 FALSE。

注释:字符串位置从 0 开始,不是从 1 开始。

例子

<?php
echo stripos(&#39;Hello world!&#39;, &#39;WO&#39;);
?>
Copy after login

输出:6

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