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<?php $available_templates = [ '' => 'Placeholder', 404 => '404', 'single' => 'Single Post', ]; $merge = array_merge( [ '' => 'Default template', ], $available_templates ); $replace = array_replace( $available_templates, [ '' => 'Default template', ] ); var_dump( $merge ); var_dump( $replace );
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { [""]=> string(11) "Placeholder" [0]=> string(3) "404" ["single"]=> string(11) "Single Post" } array(3) { [""]=> string(16) "Default template" [404]=> string(3) "404" ["single"]=> string(11) "Single Post" }

preferences:
154.52 ms | 403 KiB | 152 Q