strtolower()

(PHP 4, PHP 5, PHP 7)

将字符串转化为小写

说明

将 $string 中所有的字母字符转换为小写并返回。

注意 “字母” 与当前所在区域有关。例如，在默认的 “C” 区域，字符 umlaut-A（ä）就不会被转换。

参数

$string

输入字符串。

返回值

返回转换后的小写字符串。

范例

strtolower() 范例

注释

Note: 此函数可安全用于二进制对象。

参见

• strtoupper()将字符串转化为大写
• ucfirst()将字符串的首字母转换为大写
• ucwords()将字符串中每个单词的首字母转换为大写
• mb_strtolower()使字符串小写

strtolower(); doesn't work for polish chars

will return: mĄka;
the best solution - use mb_strtolower()

will return: mąka

for cyrillic and UTF 8 use mb_convert_case
exampel

It is worth noting that 

returns: 
string(0) ""

the function arraytolower will create duplicate entries since keys are case sensitive. 

/*
Array
(
  [test1] => asgafasdaad
  [TEST2] => ASddhshsDGb
  [TeSt3] => asdasda@asdadadASDASDgh
  [test2] => asddhshsdgb
  [test3] => asdasda@asdadadasdasdgh
)
*/
I prefer this method

which when used like this

will give output of 
Array
(
  [test1] => asgafasdaad
  [TEST2] => asddhshsdgb
  [TeSt3] => asdasda@asdadadasdasdgh
)
Array
(
  [test1] => asgafasdaad
  [test2] => asddhshsdgb
  [test3] => asdasda@asdadadasdasdgh
)

It's not suitable for every occasion, but it surely gets in handy. I use it for lowering German 'Umlauts' like ä and ö.

Slovenian characters

If you're considering using the below unhtmlentities function from phpContrib, I would suggest this one as an alternative:

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