在PHP 7 版本之前，?: 這種寫法稱為，「Ternary Operator」:
$data = isset($data) ? $data : 'hello';

PHP 7 之後，??這種寫法稱為「Null Coalescing Operator」:
$data = $data ?? 'hell

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<div class="draft-block draft--p left">在PHP 7 版本之前，?: 這種寫法稱為，「Ternary Operator」:<br>$data = isset($data) ? $data : 'hello';</div>
<div class="hr__AtomHrContainer-sc-1afmttx-0 dsBIOm draft-block"><pre class="hr__HrWrapper-sc-1afmttx-1 hUbgX draft--hr"><hr class="hr__Hr-sc-1afmttx-2 iegMSY"></pre></div>
<div class="draft-block draft--p left">PHP 7 之後，??這種寫法稱為「Null Coalescing Operator」:<br>$data = $data ?? 'hello';<br>可以不用多判斷isset</div>
<div class="hr__AtomHrContainer-sc-1afmttx-0 dsBIOm draft-block"><pre class="hr__HrWrapper-sc-1afmttx-1 hUbgX draft--hr"><hr class="hr__Hr-sc-1afmttx-2 iegMSY"></pre></div>
<div class="draft-block draft--p left">PHP 7.4 之後寫法更簡潔，??=這種寫法稱為「Null Coalesce Assignment Operator」:<br>$data ??= 'hello';</div>
<div class="draft-block draft--p left"></div>
<div class="draft-block draft--p left"><span style="font-style: italic; ">本筆記參考:<br>1. </span><a href="https://stackoverflow.com/questions/59102708/what-is-null-coalescing-assignment-operator-in-php-7-4" target="_blank" class="draft--a"><span style="font-style: italic; ">https://stackoverflow.com/questions/59102708/what-is-null-coalescing-assignment-operator-in-php-7-4</span></a><span style="font-style: italic; "><br>2. </span><a href="https://caloskao.org/php-null-coalescing-operator/" target="_blank" class="draft--a"><span style="font-style: italic; ">https://caloskao.org/php-null-coalescing-operator/</span></a></div>

<p>在PHP 7 版本之前，?: 這種寫法稱為，「Ternary Operator」:<br>
$data = isset($data) ? $data : 'hello';</p>
<p><br></p>
<p>PHP 7 之後，??這種寫法稱為「Null Coalescing Operator」:<br>
$data = $data ?? 'hello';<br>
可以不用多判斷isset</p>
<p><br></p>
<p>PHP 7.4 之後寫法更簡潔，??=這種寫法稱為「Null Coalesce Assignment Operator」:<br>
$data ??= 'hello';</p>
<p><br></p>
<p><em>本筆記參考:<br>
1. </em><a href="https://stackoverflow.com/questions/59102708/what-is-null-coalescing-assignment-operator-in-php-7-4"><em>https://stackoverflow.com/questions/59102708/what-is-null-coalescing-assignment-operator-in-php-7-4</em></a><em><br>
2. </em><a href="https://caloskao.org/php-null-coalescing-operator/"><em>https://caloskao.org/php-null-coalescing-operator/</em></a></p>

在PHP 7 版本之前，?: 這種寫法稱為，「Ternary Operator」:
$data = isset($data) ? $data : 'hello';

PHP 7 之後，??這種寫法稱為「Null Coalescing Operator」:
$data = $data ?? 'hello';
可以不用多判斷isset

PHP 7.4 之後寫法更簡潔，??=這種寫法稱為「Null Coalesce Assignment Operator」:
$data ??= 'hello';

本筆記參考:
1. https://stackoverflow.com/questions/59102708/what-is-null-coalescing-assignment-operator-in-php-7-4
2. https://caloskao.org/php-null-coalescing-operator/

PHP Null Coalesce Assignment Operator