How to convert English to lowercase in php

How to convert English to lowercase in php: 1. Use the lcfirst() function to change the first letter of the first English word to lowercase; 2. Use the strtolower() function to change all letters to lowercase.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to convert English to lowercase in php?

Change the first letter of the first word to lowercase: lcfirst()

The code is as follows:

<?php
$foo = &#39;HelloWorld&#39;;
$foo = lcfirst($foo);             // helloWorld
$bar = &#39;HELLO WORLD!&#39;;
$bar = lcfirst($bar);             // hELLO WORLD!
$bar = lcfirst(strtoupper($bar)); // hELLO WORLD!
?>

Change all letters to lowercase: strtolower()

The strtolower() function converts a string to lowercase, and the syntax is "strtolower(string)".

Note: This function is binary safe.

Related introduction:

Convert the first letter of each word to uppercase: ucwords()

The code is as follows:

<?php
$foo = &#39;hello world!&#39;;
$foo = ucwords($foo);             // Hello World!
$bar = &#39;HELLO WORLD!&#39;;
$bar = ucwords($bar);             // HELLO WORLD!
$bar = ucwords(strtolower($bar)); // Hello World!
?>

The first letter of the first word Change to uppercase: ucfirst()

The code is as follows:

<?php
$foo = &#39;hello world!&#39;;
$foo = ucfirst($foo);             // Hello world!
$bar = &#39;HELLO WORLD!&#39;;
$bar = ucfirst($bar);             // HELLO WORLD!
$bar = ucfirst(strtolower($bar)); // Hello world!
?>

Change all letters to uppercase: strtoupper()

Recommended study: "PHP Video Tutorial》

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