php intercepts characters before comma

前置：
$foo = 'aaaaaa,vvvvvv,ccccc,dddd';
if(($index = strstr($foo,',') !== false):

答案1：用正则-》
$Regex = '#([^,]+)#is';
preg_match($Regex,$foo,$result);
echo $result[1]; //输出结果：aaaaaa
答案2：用分割字符串-》
$foo = explode(',',$foo);
echo $foo[0];  //输出结果：aaaaaa
答案3：用寻找和截取字符串-》
echo substr($foo,0,$index);   //输出结果：aaaaaa
 
后置：
:endif;

The above introduces PHP to intercept the characters before the comma, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.