php function trim () definition and syntax introduction _php tutorial

Source: Internet
Author: User
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:

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

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

Example 1

 
 
  1. PHP
  2. $ Str = "Use function trim to remove whitespace characters at both ends of a string" ;
  3. $ str1 = Trim ($STR);
  4. echo "Before processing". strlen ($STR). " Characters "; echo "<br/>";
  5. //www.phpjc.cn echo " < BR /> ";
  6. echo "has been processed with the trim function". strlen ($str 1). " Characters ";
  7. ?>

Output:

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

Example 2

 
  
  
  1. Php
  2. $ Str # #使用函数trim去掉字符串两端特定字符 # #
  3. $ str1 Trim
  4. Pass in the second argument for function trim,
    Trim will delete the string $str at both ends of the # character Echo $str. " < BR >
  5. ?>

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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