Introduction to the definition and syntax of PHP function trim ()

You are writingDefinition and usage

The PHP function trim () removes spaces and other predefined characters from both ends of the string.

Syntax

Trim (str, charlist) parameter 1 str is the string to be operated, parameter 2 charlist (optional) specifies the special symbol to be removed.

If the second parameter is not set to a value, the following characters are removed by default:

 
 

  
  
" " (ASCII 32 (0x20)), an ordinary space.   
  
  
"t" (ASCII 9 (0x09)), a tab.   
  
  
"n" (ASCII 10 (0x0A)), a new line (line feed).   
  
  
"r" (ASCII 13 (0x0D)), a carriage return.   
  
  
"" (ASCII 0 (0x00)), the NUL-byte.   
  
  
"x0B" (ASCII 11 (0x0B)), a vertical tab.  
 
 

If you want to remove other characters, you can set them in the second parameter.

Example 1

 
 

  
  
<? Php
  
  
$ Str = "Remove blank characters at both ends of the string using the trim function ";
  
  
$ Str1 = trim ($ str );
  
  
Echo "before processing". strlen ($ str). "characters"; echo "<br/> ";
  
  
// Www.phpjc.cn echo "<br/> ";
  
  
Echo "after processing with the trim function". strlen ($ str1). "characters ";
  
  
?>
 
 

Output:

39 characters before processing 34 characters after being processed using the PHP function trim ()

Example 2

 
 

  
  
<? Php
  
  
$ Str = "## remove specific characters at both ends of the string using the trim function ####";
  
  
$ Str1 = trim ($ str ,"#");
  
  
// Input the second parameter for the trim function,
Trim will delete the # character echo $ str at both ends of the string $ str. "<br> ";
  
  
Echo $ str1;
  
  
?>
 
 

Output:

# Use the PHP function trim () to remove specific characters at both ends of the string ### use the function trim to remove specific characters at both ends of the string