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Homephp教程php手册php中strstr、strrchr、substr、stristr四个函数的区别总结

这篇文章主要介绍了php中strstr、strrchr、substr、stristr四个函数的区别总结,这4个函数是PHP中常用的字符串相关函数,需要的朋友可以参考下

php中strstr、strrchr、substr、stristr四个函数用法区别:

php中strstr strrchr substr stristr这四个字符串操作函数特别让人容易混淆,常用的是substr,strstr,基本上可以满足对字符串的操作。

下面介绍一下这个几个函数的区别。

一、strstr和strcchr的区别

strstr 显示第一次找到,要查找的字符串,,以及后面的字符串。
strrchr 显示最后一次找到,要查找的字符串,以及后面的字符串。

复制代码 代码如下:


$email = 'test@test.com@jb51.net';
$domain = strstr($email, '@');
echo "strstr 测试结果 $domain
";
$domain = strrchr($email, '@');
echo "strrchr 测试结果 $domain
";
?>

结果如下:

strstr 测试结果 @test.com@jb51.net
strrchr 测试结果 @jb51.net

二、strstr和stristr的区别

strstr是大小写敏感的。
stristr是大小写不敏感的。

复制代码 代码如下:


$email = 'zhangYing@jb51.net';
$domain = strstr($email, 'y');
echo "strstr 测试结果 $domain
";
$domain = stristr($email, 'y');
echo "stristr 测试结果 $domain
";
?>

结果如下:

strstr 测试结果 jb51.net
stristr 测试结果 Ying@jb51.net

三、strstr和substr的区别

strsr是匹配后截取。
substr是不匹配,根据起始位置,进行截取。

复制代码 代码如下:


$email = 'zhangYing@jb51.net';
$domain = strstr($email, 'y');
echo "strstr 测试结果 $domain
";
$domain = substr($email,-7);
echo "substr 测试结果 $domain
";
?>

结果如下:
strstr 测试结果 jb51.net
substr 测试结果 jb51.net

把这个几个字符串截取函数搞明白了,在开发时可以省不少事

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