Echo, print, sprint, sprintf output

Echo () function definition and usage

The echo () function outputs one or more strings.

Syntax

echo(strings)

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

 

 

Tips and comments

Note: ECHO () is actually not a function, so you do not need to use parentheses for it. However, if you want to pass one or more parameters to echo (), a parsing error occurs when brackets are used.

Tip: The echo () function is a little faster than the print () function.

Tip: The echo () function can use the simplified syntax. See example 5.

Example 1

<?php$str = "Who‘s John Adams?";echo $str;echo "<br />";echo $str."<br />I don‘t know!";?>

Output:

Who‘s John Adam?Who‘s John Adam?I don‘t know!

Example 2

<?phpecho "This textspans multiplelines.";?>

Output:

This text spans multiple lines.

Example 3

<?phpecho ‘This ‘,‘string ‘,‘was ‘,‘made ‘,‘with multiple parameters‘;?>

Output:

This string was made with multiple parameters

Example 4

The difference between single quotes and double quotes. Single quotes only output variable names, not values:

<?php$color = "red";echo "Roses are $color";echo "<br />";echo ‘Roses are $color‘;?>

Output:

Roses are redRoses are $color

Example 5

Simplified Syntax:

<?=$color?></p></body>Print () function definition and usage
The print () function outputs one or more strings.
print(strings)

 

 
  
 
   
 
    
Parameters
 
    
Description
 
   
 
   
 
    
Strings
 
    
Required. One or more strings sent to the output.
 
   
 
  

 
 
 
Tips and comments
Note: The print () function is not actually a function, so you do not need to use parentheses for it.
Note: The print () function is a little slower than echo ().
Example 1
<?php$str = "Who‘s John Adams?";print $str;print "<br />";print $str."<br />I don‘t know!";?>
Output:
Who‘s John Adams?Who‘s John Adams?I don‘t know!
Example 2
<?phpprint "This textspans multiplelines.";?>
Output:
This text spans multiple lines.
Example 3
<?php$color = "red";print "Roses are $color";print "<br />";print ‘Roses are $color‘;?>
Output:
Roses are redRoses are $color
Sprintf () function definition and usage
The sprintf () function writes formatted strings to a variable.
Syntax
sprintf(format,arg1,arg2,arg++)

 

 
  
 
   
 
    
Parameters
 
    
Description
 
   
 
   
 
    
Format
 
    
Required. Conversion format.
 
   
 
   
 
    
Arg1
 
    
Required. Required to be insertedFormatThe parameter at the first % symbol in the string.
 
   
 
   
 
    
Arg2
 
    
Optional. Required to be insertedFormatThe parameter at the second % sign in the string.
 
   
 
   
 
    
Arg ++
 
    
Optional. Required to be insertedFormatThe third, fourth, and other % parameters in the string.
 
   
 
  

 
 
 
 
 
Description
ParametersFormatIs the conversion format, starting from the percent sign ("%") to the end of the conversion character. PossibleFormatValue:

 

 
  
%-Percentage sign returned
 
  
% B-binary number
 
  
% C-Characters Based on ASCII values
 
  
% D-Signed decimal number
 
  
% E-resumable counting (for example, 1.5e + 3)
 
  
% U-Unsigned decimal number
 
  
% F-floating point number (local settings aware)
 
  
% F-floating point number (not local settings aware)
 
  
% O-octal values
 
  
% S-string
 
  
% X-hexadecimal (lowercase letter)
 
  
% X-hexadecimal (uppercase letters)

 
Arg1,Arg2,++And other parameters will be inserted to the percent sign (%) in the main string. This function is executed step by step. In the first % symbol, insertArg1, Insert at the second % symbolArg2, And so on.
Tips and comments
Note: If the % symbol is greaterARGParameter, you must use a placeholder (variable location ). The placeholder is inserted after the % symbol, which consists of numbers and "\ $. See example 3.
Example 1
<?php$str = "Hello";$number = 123;$txt = sprintf("%s world. Day number %u",$str,$number);echo $txt;?>
Output:
Hello world. Day number 123
Example 2
<?php$number = 123;$txt = sprintf("%f",$number);echo $txt;?>
Output:
123.000000
Example 3
<?php$number = 123;$txt = sprintf("With 2 decimals: %1\$.2f<br />With no decimals: %1\$u",$number);echo $txt;?>
Output:
With 2 decimals: 123.00 With no decimals: 123