How to use php trim function
php trim function is used to remove blank characters or other predefined characters on both sides of a string. Its syntax is trim(string,charlist), and the parameter string is required. Specifies the string to check.
#How to use the php trim function?
Definition and usage
#trim() function removes whitespace characters or other predefined characters on both sides of a string.
Related functions:
ltrim() - Removes whitespace characters or other predefined characters on the left side of a string.
rtrim() - Removes whitespace characters or other predefined characters on the right side of a string.
Syntax
trim(string,charlist)
Parameters
string Required. Specifies the string to check.
charlist Optional. Specifies which characters are removed from a string.
If this parameter is omitted, all the following characters are removed:
"\0" - NULL
"\t" - Tab character
"\n" - line feed
"\x0B" - vertical tab character
"\r" - carriage return
" " - space
Return value: Returns the modified string.
PHP version: 4
Change log:
In PHP 4.1, the charlist parameter is added.
Example 1
Remove spaces on both sides of the string:
<?php $str = " Hello World! "; echo "Without trim: " . $str; echo "<br>"; echo "With trim: " . trim($str); ?>
The HTML output of the above code is as follows (view source code):
<!DOCTYPE html> <html> <body> Without trim: Hello World! <br>With trim: Hello World! </body> </html>
The browser output of the above code is as follows:
Without trim: Hello World! With trim: Hello World!
Example 2
Remove the newline characters (\n) on both sides of the string:
<?php $str = "nnnHello World!nnn"; echo "Without trim: " . $str; echo "<br>"; echo "With trim: " . trim($str); ?>
The HTML output of the above code is as follows (view source code):
<!DOCTYPE html> <html> <body> Without trim: Hello World! <br>With trim: Hello World! </body> </html>
The browser output of the above code is as follows:
Without trim: Hello World! With trim: Hello World!
Example 3
Remove characters on the left side of the string ("He" in "Hello" and "d!" in "World"):
<?php $str = "Hello World!"; echo $str . "<br>"; echo trim($str,"Hed!"); ?>
Output:
Hello World! llo Worl
The above is the detailed content of How to use php trim function. For more information, please follow other related articles on the PHP Chinese website!
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