1、PHP截取两个指定字符中间的字符php
$a = "123@abc#456";
c#
$b= (strpos($a,"@"));函数
$c= (strpos($a,"#"));字符串
echo substr($a,$b+1,$c-1);io
2、经常使用截取字符串方法。function
//构造字符串
class
$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";乱码
echo "原字符串:".$str."程序
";方法
//按各类方式进行截取
$str1 = substr($str,5);
echo "从第5个字符开始取至最后:".$str1."
";
$str2 = substr($str,9,4);
echo "从第9个字符开始取4个字符:".$str2."
";
$str3 = substr($str,-5);
echo "取倒数5个字符:".$str3."
";
$str4 = substr($str,-8,4);
echo "从倒数第8个字符开始向后取4个字符:".$str4."
";
$str5 = substr($str,-8,-2);
echo "从倒数第8个字符开始取到倒数第2个字符为止:".$str5."
";
/*
------------------------------------------------------
参数:
$str_cut 须要截断的字符串
$length 容许字符串显示的最大长度
程序功能:截取全角和半角(汉字和英文)混合的字符串以免乱码
------------------------------------------------------
*/
function substr_cut($str_cut,$length)
{
if (strlen($str_cut) > $length)
{
for($i=0; $i < $length; $i++)
if (ord($str_cut[$i]) > 128) $i++;
$str_cut = substr($str_cut,0,$i)."..";
}
return $str_cut;
}
3、php去掉字符串最后一个字符
原字符串1,2,3,4,5,6,
去掉最后一个字符",",最终结果为1,2,3,4,5,6
代码以下:
$str = "1,2,3,4,5,6,";
$newstr = substr($str,0,strlen($str)-1);
echo $newstr;
//echo 1,2,3,4,5,6
系统自带的函数便可实现这样的效果,两种方法:
substr($str, 0, -1)
//函数2
rtrim($str, ",")