strtolower

Example

Convert all characters to lowercase:

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">strtolower</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>

Try it yourself