PHP 删除字符串中的最后一个逗号

Posted 2021-05-15

function instrrev($n,$s) {
	$x=strpos(chr(0).strrev($n),$s)+0;
	return (($x==0) ? 0 : strlen($n)-$x+1);
 }
  
function mid($s,$x,$w="") {  //$w is optional
	if ($w) {return substr($s,$x-1,$w);}
    else {return substr($s,$x-1);}
}

function deleteLastComma($valStr) {
	$lastCommaPos = instrrev($valStr, ",");
	$valStr = mid($valStr, 1, $lastCommaPos - 1);
	return  $valStr;
}