What is the difference between php output statements

Difference: 1. Both the echo() and print() functions are used to output one or more strings, but echo has no return value and is slightly faster than print; 2. The "print_r()" function is used Used to display easy-to-understand information about variables; 3. "var_dump" is used to display structural information of one or more expressions.

The operating environment of this article: Windows 10 system, PHP version 7.1, Dell G3 computer.

What is the difference between php output statements

echo In-depth understanding of echo, echo is a function

echo function: output one or more strings to the browser;

echo return value: void No return value;

    echo "今天是个好天气";

Output result:

##print function: output string to the browser

print return value: integer 1

The following example: print prints out the string, and echo prints out the return value of print

    echo(print("今天是个好天气"));

Output result:

echo runs slightly faster than print because it has no return value

print_r() displays easy-to-understand information about a variable. If a string, integer, or float is given, the variable value itself is printed. If an array is given, the keys and elements will be displayed in a certain format. object is similar to an array

For example

    $a = [1,2,3,4,];
    print_r($a);

Output result:

##var_dump() displays structural information about one or more expressions , including the type and value of the expression. Arrays will expand values ​​recursively, showing their structure through indentation.

For example:

    $b  = array( 1 ,  2 , array( "a" ,  "b" ,  "c" ));
    var_dump ( $b );

Output result:

For example:

    $d  =  3.1 ;
    $c  =  true ;
    var_dump ( $d ,  $c );

Output result:

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