PHP Diary (a) string operation PHP Split string php string merge PHP string Exchange

First, the formatting of the string

1. Processing of strings: trim (), LTrim (), RTrim ()

$name =trim ($_post[' name "), $name =trim ($_post[' password ')), $name =trim ($_post[' email ');

The trim () function can strip the starting and ending spaces of a string and return the resulting string, by default the characters that are stripped are line feed and carriage return (\ n and \ r), Horizontal and Vertical tabs (\ T and x0b)

The LTrim () function removes spaces only from the beginning of the character (left)

The RTrim () function removes spaces only from the end of the function (right)

2. Format the string to display

① Using HTML formatting: n12br () function

Insert a newline character before a new line (\ n) in a string

 
   

Results
One line. Another line.

② formatting a string for print output
printf () structure
$s = "world");p rintf ("Hello%s", $s);

3. Change the case of letters in a string

 
 

 
  
  
 
   
 
    
Function
 
    
Describe
 
    
Using $subject =hello World
 
    
return value
 
   
 
   
 
    
Strtoupper ()
 
    
Convert a string to uppercase
 
    
Strtoupper ($subject)
 
    
HELLO World
 
   
 
   
 
    
Strtolower ()
 
    
Convert a string to lowercase
 
    
Strtolower ($subject)
 
    
Hello World
 
   
 
   
 
    
Ucfirst ()
 
    
If the first character of a string is a character, capitalize it
 
    
Ucfirst ($subject)
 
    
Hello World
 
   
 
   
 
    
Ucwords ()
 
    
Capitalize the first letter of each word of a string
 
    
Ucwords ($subject)
 
    
Hello World
 
   
 
  

 
 

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