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<?php $array = [ "This is a test", "This is a TEST", "Test this testy contest protest test!", "TeSt this", ]; var_export( preg_replace('/\btest\b/i', '<b>$0</b>', $array) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 0 => 'This is a <b>test</b>', 1 => 'This is a <b>TEST</b>', 2 => '<b>Test</b> this testy contest protest <b>test</b>!', 3 => '<b>TeSt</b> this', )
preferences:
141.64 ms | 407 KiB | 5 Q