(2.)字符串的截取
$test="Your customer service is excellent"; echo substr($test,1);////////our customer service is excellent echo "<br>"; echo substr($test,-9);//////从末尾起长度是9excellent echo "<br>"; echo substr($test,0,4);////从0位置开始长度是4Your echo "<br>"; echo substr($test,5,-13);/从第四个开始到倒数第13个字符customer service echo "<br>";
$test="Your customer service is excellent"; echo substr($test,1); echo "<br>"; echo substr($test,-11); echo "<br>"; echo substr($test,0,6); echo "<br>"; echo substr($test,5,-13); echo "<br>";
our customer service is excellent s excellent Your c customer service
(3)join()字符串的链接
3.字符串的查找 (1)string strstr ( string haystack, string needle ) 别名:strchr,stristr和strstr类似不同在于不区分大小写
strrchr()相反的,查找的是最后一次出现的字符串
第一次出现起的字符串 <?php $email = 'user@example.com'; $domain = strstr($email, '@'); echo $domain; // prints @example.com ?> $email = 'user@example.com'; $domain =strstr($email,'e'); $domain2 =strrchr($email,'e');//最后一次出现起的字符串 echo $domain; echo "<br>"; echo $domain2;
er@example.com e.com
(2)查找位置
int strpos(string str,string needle,[int offset]) 没有找到返回的是false
返回从offset开始在str中查找needle的位置
$eg:$t-'hello world';
echo strpos($t,'o',5);
//7 从第o开始,查找o这个变量的位置,结果为7
int strrpos()
5.替换
str_replace("%body%","blank","<body text='%body%'")
6 。大写小问题
Strpos 查找字符串中第一次出现的字符串的位置
Strrpos 查找字符串中某字符,继第一次之后的最先出现的位置。
strpos(stripos无大小写) strrpos(strripos无大小写)
strstr stristr(无大小写)
str_replace str_ireplace(无大小写)
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