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php strstr() strrchr() strpos() strrpos()函数

WBOY
WBOYOriginal
2016-06-13 10:03:472281browse

这四个函数是字符操作函数,主要是判断字符出现的次数,有需要的朋友可以参考一下。

 代码如下 复制代码

//strstr:从左向右查找  返回值:字符串
//strrchr:从右向左查找 返回值:字符串
//strpos:从左向右查找  返回值:整型,假如查找的字符串不存在,则返回空
//strrpos:从右向左查找 返回值:整型
$str="天高任鸟飞,海阔凭鱼跃";//strstr:从左向右查找  strrchr:从右向左查找
echo "原始字符串:".$str."
";
echo "用strstr函数搜索“,”的返回结果:".strstr($str,",")."
";
echo "用strstr函数搜索“鸟飞”的返回结果:".strstr($str,"鸟飞")."
";

$str1="I have a great dream.";
echo "原始字符串:".$str1."
";
echo "用strrchr函数搜索“e”的返回结果:".strrchr($str1,"e")."
";
echo "用strrchr函数搜索“ea”的返回结果:".strrchr($str1,"ve")."
";

$str2="I am an abstract about abroad.";
echo "原始字符串为:".$str2."
";
echo "ab在字符串中的第一次出现位置为:".strpos($str2,"ab")."
";
echo "ab在字符串中的第一次出现位置为:".strpos($str2,"am")."
";
echo "abcd在字符串中第一次出现的位置为:".strpos($str2,"aman")."
";

$str3="I am is wang hui.";
echo "原始字符串为:".$str3."
";
echo "I在字符串中的最后一次出现位置为:".strrpos($str3,"I")."
";
echo "an在字符串中的最后一次出现位置为:".strrpos($str3,"an")."
";
echo "i在字符串中最后一次出现的位置为:".strrpos($str3,"i");

?>

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