(PHP 5 >= 5.3.0, PHP 7)
lcfirst — 使一锟斤拷锟街凤拷锟斤拷锟侥碉拷一锟斤拷锟街凤拷小写
$str
) : string
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Example #1 lcfirst() 锟斤拷锟接ｏ拷
<?php
$foo = 'HelloWorld';
$foo = lcfirst($foo); // helloWorld
$bar = 'HELLO WORLD!';
$bar = lcfirst($bar); // hELLO WORLD!
$bar = lcfirst(strtoupper($bar)); // hELLO WORLD!
?>