difference between echo, print

difference between echo, print, and print_r in PHP

The print and echo are both language constructs to display strings. The echo has a void return type, whereas print has a return value of 1 so it can be used in expressions. The print_r is used to display human-readable information about a variable.

Example

Let us now see an example that displays output using echo, print, and print_r:

$arr = array( “John”, “Jacob”, “Tom”, “Tim”);

echo “Array…n”;

foreach( $arr as $value ) {

echo “Value = $value n”;}

echo “nDisplaying Array Values using print…n”;

foreach( $arr as $value ) {

print( “Value = $value n”);

echo “nDisplaying Array Values using print_r…n”;

print_r($arr);

 

Output

This will produce the following output−

Array…

Value = John

Value = Jacob

Value = Tom

Value = Tim

Displaying Array Values using print…

Value = John

Value = Jacob

Value = Tom

Value = Tim

Displaying Array Values using print_r…

Array (

[0] => John

[1] => Jacob

[2] => Tom

[3] => Tim

)

 

  1. echo: echo is not a function rather it is described as a language construct. It accepts a list of arguments (multiple arguments can be passed) and returns no value or returns void. It cannot be used as a variable function in PHP. It is used to display the output of parameters that are passed to it. It displays the outputs of one or more strings separated by commas.

 

$x = “Vkprogramming”;

$y = “Computer science portal”;

// Display the value of $x

echo $x, $y;

 

Output:

Vkprogramming Computer science portal

 

  1. print: It is not a real function. it is a language construct but always returns the value 1. So it can be used as an expression. Unlike echo, print accepts only one argument at a time. It cannot be used as a variable function in PHP. The print outputs only the strings. It is slow compared to that of echo.

Example:

$x = “Vkprogramming”;

// Display the value of $x

print $x;

Output:

Vkprogramming

 

print_r(): print_r() is a regular function. It outputs detailed information about the parameter in a format with its type (of an array or an object), which can be easily understandable by humans. In this function, the output gets stored on the internal buffer when the return parameter is passed. If pass then returns parameter to TRUE, print_r() would return the complete information rather than just print it. During walk-through this function helps in identifying any of the glitches while executing the program. It is more similar to the var_dump() function.

 

Example:

$arr = array(‘0’ => “Vkprogramming”,

‘1’ => “Computer”,

‘2’ => “Science”,

‘3’ => “Portal”);

print_r($arr);

 

Output:

Array(

[0] => Vkprogramming

[1] => Computer

[2] => Science

[3] => Portal

)

Example:

$a = “Vkprogramming”;

$b = array(‘0’ => “Vk”, ‘1’ => “for”, ‘2’ => “programming”);

$c = 3.14;

$d = 7;

// Single argument

print “n$an”;

// Multiple argument

echo $c + $d . “n”;

// Return with internal output buffering

print_r($b);

 

Output:

Vkprogramming

10.14

Array(

[0] => Vk

[1] => for

[2] => Programming

)

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