Php print () and printf () function tutorial

Php print () and printf () function tutorial

Definition and usage
The print () function outputs one or more strings.

Syntax

print(strings)

 
 

  
  
 
   
 
    
Parameter
 
    
Description
 
   
 
   
 
    
strings
 
    
Required. One or more strings to be sent to the output
 
   
 
  
 
 

Tips and instructions
Note: The print () function does not have actual functions, so you do not need to use parentheses.

Tip: the print () function is slightly lower than echo ().


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Example 1
<?php$str = "Who's Kai Jim?";print $str;print "<br />";print $str."<br />I don't know!";?>
Result.
Who's Kai Jim?Who's Kai Jim?I don't know!
Now let's take a look at the printf function.
 
Definition and usage
Output the formatted string in the printf function.

The arg1, arg2, ++ parameter inserts a major string showing signs of percentage (%. Works of this function are "One step ". In first % signs, arg1 inserts, signs in second %, arg2 inserts, etc.

Syntax
printf(format,arg1,arg2,arg++)
 
    
    

     
     
 
      
 
       
Parameter
 
       
Description
 
      
 
      
 
       
Format
 
       
Required. The specified string and how to format the variable. Possible format values: %-return percent Number % number B-Binary Number % C group-character according to a SC II value % d-signature decimal number % specialized-scientific symbol (such as 1. 2 e + 2) % u-Unsigned decimal number % Female-floating point number (realized by local settings) % Female-floating point number (not realized by local settings) % s-string % of % o-No octal characters-hexadecimal (lower case) % of devices-additional value of hexadecimal (upper case) format. The % and text (for example, 0.2%, female) between these locations: + (Power Capital + and-the front number. By default, only the negative number is marked) '(specifies what is used as the fill. Default space. Must use the same width. Example: % 'x20s (this uses "X" as the fill)-(left reason variable value) [0-9] (specified variable value with the lowest hold width ). [0-9] (specify the number of decimal places or maximum String Length) Note: if there are multiple additional formats for value, they must be in the same order as above.
 
      
 
      
 
       
Arg1
 
       
Required. The argument to be inserted at the first %-sign in the format string
 
      
 
      
 
       
Arg2
 
       
Optional. The argument to be inserted at the second %-sign in the format string
 
      
 
      
 
       
Arg ++
 
       
Optional. The argument to be inserted at the third, fourth, etc. %-sign in the format string
 
      
 
     
    
    

 

Tips and instructions
Note: if there are more signs % of the above arguments, you must use placeholders. Reserved location inserted % signed by argument, quantity and "$ ". See three examples.

Tip: related functions: fprintf (), sprintf (), vfprintf (), vprintf (), and vsprintf ().


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Example 1

<?php$str = "Hello";$number = 123;printf("%s world. Day number %u",$str,$number);?>

Output result

Hello world. Day number 123
 
Instance 2.
  
  

   
   
 
    
 
     
<?php$number = 123;printf("%f",$number);?>
 
    
 
   
  
  
Result.
  
  

   
   
 
    
 
     
123.000000