How to implement case conversion of characters in php

In PHP, case conversion can be achieved through the "mb_strtoupper" and "mb_strtolower" functions. The "mb_strtoupper" function is used to convert strings to uppercase, and the "mb_strtolower" function is used to convert strings. is lowercase.

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strtoupper( ), strtolower(), ucfirst(), ucfirst(), ucwords(), mb_strtoupper(), mb_strtolower() and mb_convert_case() The differences and connections between the eight functions:

##PHP4>=4.3 .0,PHP 5strtolowermb_convert_case

Function name	Usage scope	Function
##strtoupper	PHP4 、PHP5	Convert the string to uppercase
strtolower	PHP4、PHP5	Convert the string to Lowercase
ucfirst	##PHP4、PHP5	Convert the first letter of the string to uppercase
lcfirst	PHP5>= 5.3.0	Convert the first letter of the string to lowercase
ucwords	PHP4、PHP5	Replace each string in The first character of a word is converted to upper case
##mb_strtoupper	PHP4>=4.3.0,PHP 5	Convert the string to uppercase (with the strtoupper function There is a difference)
##mb_strtolower	##Convert the string to lowercase (different from the	function)
	PHP4>=4.3.0,PHP 5	Convert strings according to different modes

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