php截取指定字符串前、后的内容

获取指定字符串前的内容

$AAA = '123_45678';
$result = substr($AAA,0,strrpos($AAA,"_"));
echo $result;//输出123

获取指定字符串后的内容

$AAA = '123_45678';
$result = substr($AAA,strripos($AAA,"_")+1);
echo $result;//输出45678