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Specify Null Coalesce Operator isset Relation #5527

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Specify Null Coalesce Operator isset Relation #5527

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4834419
Update null coalescing operator documentation
Krause-a May 1, 2026
5175638
Update comparison.xml
Krause-a May 5, 2026
5ee742e
Update comparison.xml
Krause-a May 6, 2026
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13 changes: 6 additions & 7 deletions language/operators/comparison.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -462,7 +462,7 @@ echo 0 ?: 0 ?: 0 ?: 3, PHP_EOL; //3
// Example usage for: Null Coalesce Operator
$action = $_POST['action'] ?? 'default';

// The above is identical to this if/else statement
// The above is equivalent to this if/else statement
if (isset($_POST['action'])) {
$action = $_POST['action'];
} else {
Expand All @@ -473,14 +473,13 @@ if (isset($_POST['action'])) {
</programlisting>
</example>
The expression <literal>(expr1) ?? (expr2)</literal> evaluates to
<replaceable>expr2</replaceable> if <replaceable>expr1</replaceable> is
&null;, and <replaceable>expr1</replaceable> otherwise.
<replaceable>expr1</replaceable> if <replaceable>expr1</replaceable> is set
and not &null;, otherwise <replaceable>expr2</replaceable>.
</para>
<para>
<simpara>
In particular, this operator does not emit a notice or warning if the left-hand side
value does not exist, just like <function>isset</function>. This is especially
useful on array keys.
</para>
value is not set. This is especially useful on array keys.
</simpara>
<note>
<simpara>
Please note that the null coalescing operator is an expression, and that it
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