详解PHP处理字符串类似indexof的方法函数
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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)
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('Hello world!', 'wo'); ?>
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)
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('Hello world!', 'WO'); ?>
输出:6
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