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PHP 8.4: Single underscore as class name is deprecated #4099

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Nov 20, 2024
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PHP 8.4: Single underscore as class name is deprecated #4099

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10 changes: 6 additions & 4 deletions language/oop5/basic.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,10 +14,12 @@
</para>
<para>
The class name can be any valid label, provided it is not a
PHP <link linkend="reserved">reserved word</link>. A valid class
name starts with a letter or underscore, followed by any number of
letters, numbers, or underscores. As a regular expression, it
would be expressed thus:
PHP <link linkend="reserved">reserved word</link>.
As of PHP 8.4.0, using a single underscore <literal>_</literal> as a
class name is deprecated.
A valid class name starts with a letter or underscore,
followed by any number of letters, numbers, or underscores.
As a regular expression, it would be expressed thus:
<code>^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$</code>.
</para>
<para>
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