Can php directly output an array?

php can directly output an array. There are two methods: 1. Use print_r() to output the array content and structure, and display the keys and elements according to a certain format. The syntax is "print_r (array)"; 2. , use var_dump() to output the content and structure, and display the element type, the syntax is "var_dump (array)".

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

php can directly output arrays.

There are two built-in functions in php that can directly output arrays:

• print_r() function

• var_dump () function

1. Use print_r() to output the array

The print_r() function is used to make it easier Print variables in the form you understand. The print_r() function can output the contents and structure of the entire array, and the keys and elements will be displayed in a certain format.

<?php
header("Content-type:text/html;charset=utf-8");
$array = array
(
    array("姓名"=>"张三","年龄"=>25,"性别"=>"男"),
    array("姓名"=>"李四","年龄"=>21,"性别"=>"男"),
    array("姓名"=>"娜娜","年龄"=>22,"性别"=>"女")
);
 print_r($array);
?>

Output result:

Array ( [0] => Array ( [姓名] => 张三 [年龄] => 25 [性别] => 男 ) [1] => Array ( [姓名] => 李四 [年龄] => 21 [性别] => 男 ) [2] => Array ( [姓名] => 娜娜 [年龄] => 22 [性别] => 女 ) )

Do you feel that the output result is too long and you do not use reading. You can add a piece of code "echo '<pre class="brush:php;toolbar:false">';</pre>" before the print_r() output statement:

<?php
header("Content-type:text/html;charset=utf-8");
$array = array
(
    array("姓名"=>"张三","年龄"=>25,"性别"=>"男"),
    array("姓名"=>"李四","年龄"=>21,"性别"=>"男"),
    array("姓名"=>"娜娜","年龄"=>22,"性别"=>"女")
);
echo &#39;<pre class="brush:php;toolbar:false">&#39;;
 print_r($array);
?>

The output result will be more conducive to reading, the output result:

2. Use var_dump() to output the array

Similar to the print_r() function, the var_dump() function also The data content and structure of the entire array can be output. However, var_dump() is more powerful than print_r(). It can print multiple variables at the same time and give the type information of the variables.

The var_dump() function can output relevant information (type and value) of variables. When outputting an array, the array will recursively expand the values ​​and display its structure through indentation.

<?php
header("Content-type:text/html;charset=utf-8");
$array = array
(
    array("姓名"=>"张三","年龄"=>25,"性别"=>"男"),
    array("姓名"=>"李四","年龄"=>21,"性别"=>"男"),
    array("姓名"=>"娜娜","年龄"=>22,"性别"=>"女")
);
 var_dump($array);
?>

Output result:

Explanation:

print_r() and var_dump() functions are generally used For use in debugging programs, echo is often used to output specific array unit values.

<?php
header("Content-type:text/html;charset=utf-8");
$array = array(1,2,3,4,5);
echo $array[0]."<br>";
$array = array("id"=>25,"name"=>"李华","age"=>18);
echo $array["name"];
?>

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