How to convert the first character to uppercase in php? Introduction to ucfirst() function

It is very simple to modify the case of a string in PHP. You can use the built-in function to complete it. Among them, PHP provides the ucfirst() function which can be used to convert the first letter of the string to uppercase. For specific usage, please refer to The following code:

$str = 'hello, world';
$str = ucfirst($str);
echo $str; //输出：Hello, world

In the above code, the ucfirst() function is used to convert the first letter of the string to uppercase. It should be noted that this function will only convert the first character of the string to uppercase, leaving the remaining characters unchanged.

Of course, there may be some friends who are not familiar with the ucfirst() function. Here I will provide a custom function to implement this function, as follows:

function upperCaseFirstLetter($str) {
    if(strlen($str) > 0) {
        $temp = strtolower($str[0]);
        $temp[0] = strtoupper($temp[0]);
        return $temp.substr($str, 1);
    }
    return $str;
}

In the above code, it is customized A function called upperCaseFirstLetter(), this function can convert the first letter of the string to uppercase and return it. It should be noted that this function will convert all the first letters of the string to uppercase, and is not limited to the first character, as follows:

$str = 'i am a php programer';
$str = upperCaseFirstLetter($str);
echo $str; //输出：I Am A Php Programer

It can be seen that our custom function converts the first letter of each word in the string to uppercase, while the native ucfirst() function can only convert the first letter to uppercase. We need to implement it ourselves.

Of course, you can easily convert the first letter of a PHP string to uppercase, whether using the system's own ucfirst() function or the custom upperCaseFirstLetter() function.

The above is the detailed content of How to convert the first character to uppercase in php? Introduction to ucfirst() function. For more information, please follow other related articles on the PHP Chinese website!