Can php directly output an array?-PHP Problem-php.cn

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)".

Can php directly output an 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.

"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); ?>

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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 ) )

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Can php directly output an array?

Do you feel that the output result is too long and you do not use reading. You can add a piece of code "echo '

';" before the print_r() output statement: 
"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 ''; print_r($array); ?>
        
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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.
        
         "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); ?>
         
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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.
        
         "; $array = array("id"=>25,"name"=>"李华","age"=>18); echo $array["name"]; ?>
         
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