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<?php $string = "tHis iS a StRinG thAt NeEds ProPer CapiTilization"; echo mb_convert_case($string, MB_CASE_TITLE, 'UTF-8');
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
This Is A String That Needs Proper Capitilization

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86.53 ms | 1388 KiB | 4 Q