检查字符串$str的第一个字母是否是a，最后一个字母是否也是a最简单的方法是什么？
if($str[0] == a && $str[strlen($str) - 1] == a ) {
//do whatever you wanted
}
if(substr($str, 0,1) == "a" && substr( $str,-1) == "a")
{
// code
}
或者使用substr获取最后一个字符：
if($str[0] == a && substr($str,-1) == a ) {
//do whatever you wanted
}
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