PHP之mb_strripos使用

2018-02-08 10:25:14来源:segmentfault作者:zhangrxiang人点击

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mb_strripos

(PHP 4 >= 4.0.6, PHP 5, PHP 7)
mb_strrpos — Find position of last occurrence of a string in a string
mb_strripos — 大小写不敏感地在字符串中查找一个字符串最后出现的位置

Description
int mb_strrpos (
string $haystack ,
string $needle [,
int $offset = 0 [,
string $encoding = mb_internal_encoding() ]]
)
//Performs a multibyte safe strrpos() operation based on the number of characters. needle position is counted from //the beginning of haystack. First character's position is 0. Second character position is 1.//mb_strripos() 基于字符数执行一个多字节安全的 strripos() 操作。 needle 的位置是从 haystack 的开始进行统计的。 第一个字符的位置//是 0,第二个字符的位置是 1。 和 mb_strrpos() 不同的是,mb_strripos() 是大小写不敏感的。Parameters
haystackThe string being checked, for the last occurrence of needle
查找 needle 在这个字符串中最后出现的位置。needleThe string to find in haystack.
在 haystack 中查找这个字符串。offsetMay be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string.
在 haystack 中开始搜索的位置。encodingThe encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.
使用的字符编码名称。如果省略了,则将使用内部编码。Return ValuesReturns the numeric position of the last occurrence of needle in the haystack string. If needle is not found, it returns FALSE.
返回字符串 haystack 中 needle 最后出现位置的数值。 如果没有找到 needle,它将返回 FALSE。Example
<?php
/**
* Created by PhpStorm.
* User: zhangrongxiang
* Date: 2018/2/5
* Time: 下午11:00
*/$str = "Life is short,I use PHP";
$por = mb_strripos( $str, "php", 10 );
echo $por . PHP_EOL; //20function startsWith( $haystack, $needle ) {
$res = false;
if ( mb_strripos( $haystack, $needle, 0, "utf-8" ) === 0 ) {
$res = true;
}return $res;
}function endsWith( $haystack, $needle ) {
$res = false;
$len = mb_strlen( $haystack );
$pos = $len - mb_strlen( $needle );
if ( mb_strripos( $haystack, $needle, 0, "utf-8" ) === $pos ) {
$res = true;
}return $res;
}if ( startsWith( $str, "life" ) ) {
//true
echo "startsWith($str,life)" . PHP_EOL;
}if ( startsWith( $str, "php" ) ) {
echo "startsWith($str,php)" . PHP_EOL;
} else {
//false
echo "No startsWith($str,php)" . PHP_EOL;
}if ( endsWith( $str, "php" ) ) {
//true
echo "endsWith($str,php)" . PHP_EOL;
}if ( endsWith( $str, "life" ) ) {
echo "endsWith($str,life)" . PHP_EOL;
} else {
//false
echo "No endsWith($str,life)" . PHP_EOL;
}文章参考
http://php.net/manual/en/func...
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