ucfirst
Set the first character of the string to uppercase
Convert the first character of "hello" to uppercase:
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token keyword">echo</span> <span class="token function">ucfirst</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"hello world!"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>