php function trim () definition and syntax introduction _php tutorial

Everyone is writing Definition and Usage

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

Grammar

Trim (str,charlist) parameter 1 str is the string to be manipulated, parameter 2 charlist optional, specifies the special symbol you want to remove.

If the second parameter does not give a value, the preset removes the following characters:

 
  
  

  
   
   
"(ASCII (0x20)), an ordinary space. 
  
   
   
"T" (ASCII 9 (0x09)), a tab. 
  
   
   
"N" (ASCII (0x0A)), a new line (line feed). 
  
   
   
"R" (ASCII (0x0D)), a carriage return. 
  
   
   
"" (ASCII 0 (0x00)), the Nul-byte. 
  
   
   
"x0b" (ASCII One (0x0B)), a vertical tab. 
 
  
  

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

Example 1

 
 

  
  

  
 PHP  
  
  

  
$ Str  =  "Use function trim to remove whitespace characters at both ends of a string" ; 
  
  

  
$ str1  =  Trim ($STR);
  
  

  
echo "Before processing". strlen ($STR). " Characters "; echo "<br/>";
  
  

  
//www.phpjc.cn echo " < BR /> "; 
  
  

  
echo "has been processed with the trim function". strlen ($str 1). " Characters ";
  
  

  
?>  
 
 

Output:

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

Example 2

 
  
  

  
   
   
 Php
  
   
   
$ Str  # #使用函数trim去掉字符串两端特定字符 # #
  
   
   
$ str1  Trim
  
   
   
Pass in the second argument for function trim,
Trim will delete the string $str at both ends of the # character Echo $str. " < BR >
  
   
   

  
   
   
?>
 
  
  

Output:

# #使用PHP函数trim () remove specific characters at both ends of a string # # # # Use function trim to remove specific characters at both ends

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