What are the php output methods?

php output method: 1. Use the echo statement to output, for example "echo 'hi!'"; 2. Use the print statement to output; 3. Use the printf() function to output, for example "printf("hi") "; 4. Use print_r() to output; 5. Use var_dump() to output.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP output method

echo

echo is a language structure that can be used without or with parentheses. : echo or echo(). (Strings can contain HTML tags)

echo 'helloworld！';

print statement

print is also a language structure, brackets may or may not be used Brackets: print or print().

print('helloworld！'); //输出成功返回1，失败返回0。

printf() function

The printf() function can also realize output, and can output ordinary strings and formatted output. Example:

<?php
$a=20;
printf("输出：");
printf("a=%f",$a);
?>

Output:

输出：a=20.000000

print_r()

print_r Displays easy-to-understand information about a variable Information, if string, integer or float is given, the variable value itself will be printed.

If array is given, the keys and elements will be displayed in a certain format. object is similar to an array.

1. You must add brackets when using: print_r().

2. print_r() will move the pointer of the array to the end. Use reset() to return the pointer to the beginning.

<?php
$a = array (&#39;a&#39; => &#39;apple&#39;, &#39;b&#39; => &#39;banana&#39;, &#39;c&#39; => array (&#39;x&#39;,&#39;y&#39;,&#39;z&#39;));
echo "<pre class="brush:php;toolbar:false">";
print_r ($a);
echo "

"; ?>

Output:

Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )

)

var_dump()

Print the relevant information of the variable, this Functions display structural information about one or more expressions, including the expression's type and value. Arrays will expand values ​​recursively, showing their structure through indentation.

<?php
$var_name=array(99,&#39;w3resource&#39;,67899.99, array(&#39;X&#39;,&#39;Y&#39;,1));
var_dump($var_name);
?>

Output:

array (size=4)
  0 => int 99
  1 => string 'w3resource' (length=10)
  2 => float 67899.99
  3 => 
    array (size=3)
      0 => string 'X' (length=1)
      1 => string 'Y' (length=1)
      2 => int 1

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