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<?php $search = 'The'; $replace = 'A'; $subject = "The Quick Brown Fox Jumps Over The Lazy Dog's Thermos!"; echo preg_replace( '/.*\K' . preg_quote($search, '/') . '/i', $replace, $subject );
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
The Quick Brown Fox Jumps Over The Lazy Dog's Armos!

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135.15 ms | 407 KiB | 5 Q