PHP function introduction—trim(): remove spaces at both ends of a string

PHP function introduction—trim(): remove spaces at both ends of a string

In PHP development, we often encounter situations where strings need to be processed. The trim() function is one of the commonly used string processing functions in PHP. It can be used to remove spaces at both ends of a string, which is very convenient and practical. This article will introduce the usage of trim() function, and attach code examples.

The basic usage of the trim() function is as follows:

string trim(string $str, string $character_mask = "     
")

This function receives two parameters: the string $str to be operated on and the optional character mask $character_mask. By default, $character_mask will remove spaces at both ends of the string (including common spaces, tabs, newlines, etc.).

The following is a simple example demonstrating the basic usage of the trim() function:

$str = "  Hello, World!   ";
echo "原始字符串：'" . $str . "'";
echo "操作后的字符串：'" . trim($str) . "'";

Output result:

原始字符串：'  Hello, World!   '
操作后的字符串：'Hello, World!'

In the above example, the original string $ str contains extra spaces at both ends. By using the trim($str) function, the spaces at both ends of the string are successfully removed, and the manipulated string is obtained.

In addition to the default usage, the trim() function can also remove specified characters or character sets at both ends of the string through the $character_mask parameter.

The following is an example with the $character_mask parameter:

$str = "XOXHello, World!OXOX";
echo "原始字符串：'" . $str . "'";
echo "操作后的字符串：'" . trim($str, "XO") . "'";

Output result:

原始字符串：'XOXHello, World!OXOX'
操作后的字符串：'Hello, World!'

In the above example, the original string $str contains X and O character. By using the trim($str, "XO") function, the X and O characters at both ends of the string are successfully removed, and the manipulated string is obtained.

It should be noted that the trim() function will only remove the characters at both ends of the string, but not the characters in the middle of the string.

Summary:
Through the introduction of this article, everyone understands the basic usage of the trim() function. It can easily remove spaces or specified characters at both ends of a string, which is very convenient and practical. In daily PHP development, mastering the usage of the trim() function will improve our efficiency in string processing. I hope this article is helpful to everyone, thank you for reading!

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