What is php error suppressor?

php error suppressor is "@", PHP supports an error control operator, that is, "@", when the "@" symbol is placed before a PHP expression, the expression may produce any Error messages are ignored.

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PHP error suppressor @ Parsing and operators take precedence Level

PHP supports an error control operator: @. When placed before a PHP expression, any error message that expression may produce is ignored.

Operator precedence

/**
 * 下列程序中请写出打印输出的结果
 * <?php
 *
 * $a = 0;
 * $b = 0;
 *
 * if ($a = 3 > 0 || $b = 3 > 0) 
 * {
 *      $a++;
 *      $b++;
 *      echo $a. "\n";
 *      echo $b. "\n";
 * }
 */
$a = 0;
$b = 0;
// 优先级顺序 > || =
if ($a = 3 > 0 || $b = 3 > 0) 
{
    $a++;
    $b++;
    echo $a. "\n";
    echo $b. "\n";
}
输出 ：1 1 
（$a=true,$b=1）

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