The trim () function removes spaces and other predefined characters from both ends of the string. Remove leading and trailing spaces.
Assume that there is a string "ddd dd d", which is "ddd dd d" after Trim ".
You can remove unnecessary spaces (including tabs) on both sides, but do not remove spaces in the middle.
The trim () function in PHP has the same usage as the trim () function in ASP. if you have been familiar with ASP, you will naturally use it.
The usage is relatively simple. add the following to the variable to remove spaces:
Echo trim ($ variable );
?>
It is generally used for user password processing.
Definition and usage
The trim () function removes spaces and other predefined characters from both ends of the string.
Syntax
Trim (string, charlist) parameter description
String is required. Specifies the string to be checked.
Charlist is optional. Specifies the string to be converted. If this parameter is omitted, all the following characters are deleted:
"\ 0"-NULL
"\ T"-tab
"\ N"-new line
"\ X0B"-vertical list operator
"\ R"-Press enter
""-General white space characters
Example 1
The code is as follows:
$ Str = "Hello World! ";
Echo "Without trim:". $ str;
Echo"
";
Echo "With trim:". trim ($ str );
?>
Output:
The code is as follows:
Without trim: Hello World!
With trim: Hello World! HTML source code:
Example 2
The code is as follows:
$ Str = "\ r \ nHello World! \ R \ n ";
Echo "Without trim:". $ str;
Echo"
";
Echo "With trim:". trim ($ str );
?>
Output:
Without trim: Hello World!
With trim: Hello World! HTML
