[PHP] 三元運算式 – Ternary Operator (?:) – 簡化if (符號:問號/冒號 | ? | : )

簡介

三元運算子,在許多程式語言都會有,基本上您可以把它想成是if的一種簡化.

直接來看例子比較:

// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];

// The above is identical to this if/else statement
if (empty($_POST['action'])) {
    $action = 'default';
} else {
    $action = $_POST['action'];
}

可以直接參考官方文件:PHP Comparison Operators – Ternary Operator


更簡短寫法

PHP Shorthand Overview – Assignment Operators (Ternary Operator)

來個範例:

// Equal to $foo = $bar ? $bar : $baz;
$foo = $bar ?: $baz;

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