How to implement case conversion in PHP?

We know that the strtolower function can be used to achieve case conversion in PHP, so today I will give you a detailed introduction on how to use PHP to achieve this effect.

1, Convert string to lowercase

strtolower function: This function converts all the characters of the incoming string parameter into lowercase, and form puts this string back.

Example:

<?php
  $str = "I want To FLY";
  $str = strtolower($str);
  echo $str;
?>

Output:

i want to fly

2, convert the characters to uppercase

strtoupper函数：该函数的作用同strtolower函数相反，是将传入的字符参数的字符全部转换成大写，并以大写的形式返回这个字符串。

The usage is the same as strtolower().

Here are two more useful functions.

3, convert the first character of the string to uppercase

ucfirst函数： 该函数的作用是将字符串的第一个字符改成大写，该函数返回首字符大写的字符串。

The usage is similar to the strtolower() function.

4, convert the first character of each word in the string to uppercase

ucwords： 该函数将传入的字符串的每个单词的首字符变成大写。如"hello world"，经过该函数处理后，将返回"Hello Word"。

The usage is similar to strtolower().

Focus on the most commonly used functions

When writing PHP programs, you often need to convert uppercase and lowercase strings. Here are some of the most commonly used functions

strtolower() //将字符串转换为小写形式 
strtoupper() //将字符串转换为大写形式 
ucfirst() //将字符串的第一个字符转换为大写形式 
ucwords() //将字符串中每一个单词的首字母转换为大写形式

I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

Related reading:

Examples to explain Ajax asynchronous request technology

What is the common syntax of AJAX

PHP product flash sale timing implementation (solution to large traffic)

The above is the detailed content of How to implement case conversion in PHP?. For more information, please follow other related articles on the PHP Chinese website!