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@ 2018-11-10T16:55:05Z

<?php

$str="I am a string with several periods.period #1. period #2.";
$strings = explode('.', $str);
$titleCased = [];

foreach($strings as $s){
    $titleCased[] = ucfirst(trim($s));
}
echo join(".", $titleCased);

Output
Performance
VLD
References
Branches

explode: documentation ( source)
trim: documentation ( source)
ucfirst: documentation ( source)
join: documentation ( source)

preferences:dark modelive previewkey bindings

32.1 ms | 407 KiB | 5 Q