Question

我从MYSQL数据库中获取数据后，我有一个简单的除法计算

$calculation = round($number1/$number2,2);

有时$ number2作为0从数据库出来，我得到除零错误，有没有办法防止除零警告并默认显示零？

Answer 1

$gpg = $games == 0 ? 0 : round($goals / $games, 2);
$mpg = $goals == 0 ? 0 : round($minutes / $goals);

Answer 2

使用条件：

$gpg = round($goals/($games ? $games : 1),2); // forces divisor to be 1 if $games == 0 
$mpg = round($minutes/($goals ? $goals : 1,2); // forces divisor to be 1 if $goals == 0

注意：这会产生0个值。您可能希望使用if / else逻辑来说明某个数据“不适用”，或者在您有0除数时尝试计算这些统计数据。

格式化：

echo number_format($theNumber, 2);

示例：

echo number_format(1, 2); // outputs 1.00

Answer 3

if($goals != 0){
  $gpg = round($goals/$games,2);
  $mpg = round($minutes/$goals,2);
}

Answer 4

您需要一个例外，或在检测到除零之前，请查看：

<?php
/* Detect division by zero in PHP
 * 
 * More info:
 * 
 * - http://rosettacode.org/wiki/Detect_division_by_zero
 * -  http://www.php.net/trigger_error
 * -   http://php.net/error_get_last
 * 
 */ 
function tryDivision($x, $y) {
  $defaultVal = -1;
  @trigger_error('');
  $result = @($x / $y);
  if( $result === false) {
    /* Debug ERROR:
     * $e = error_get_last();
     * echo $e['message']; -> Division by zero
     * more information check: var_dump($e);
     */
    return $defaultVal;
  }
  return round($result, 2);
}

$gpg = tryDivision($goals, $games);
$mpg = tryDivision($minutes, $goals);

如何绕过PHP中的除零警告？

4 个答案: