What are the types of arrays in php-PHP Problem-php.cn

What are the types of arrays in php

There are four types of arrays in php

Numeric arrays:Arrays with numeric ID keys

Associative array:An array with specified keys, each key is associated with a value

Multidimensional array:An array containing one or more

Ordinary array:Usually the entire array cannot be echoed directly (recommended learning:PHP programming from entry to proficiency)


        
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key Value array,is preceded by the key and followed by the value

$tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’); var_dump($tu); //遍历数组 foreach($tu as $key =>$value) { var_dump($key.'-------'.$value); //输出键 var_dump($value); //输出值 }

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Output status

array (size=4) ‘sex’ => string ‘男’ (length=3) ‘height’ => string ‘170cm’ (length=5) ‘heavy’ => string ‘125’ (length=3) ‘name’ => string ‘吾志高’ (length=9) D:\wamp64\www\base\array.php:18:string ‘sex-------男’ (length=13) D:\wamp64\www\base\array.php:19:string ‘男’ (length=3) D:\wamp64\www\base\array.php:18:string ‘height-------165cm’ (length=18) D:\wamp64\www\base\array.php:19:string ‘170cm’ (length=5) D:\wamp64\www\base\array.php:18:string ‘heavy-------125’ (length=15) D:\wamp64\www\base\array.php:19:string ‘125’ (length=3) D:\wamp64\www\base\array.php:18:string ‘name-------吾志高’ (lengt=20) D:\wamp64\www\base\array.php:19:string ‘吾志高’ (length=9)

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Associative array, note that between the two arrays Comma, semicolon at the end of the array

$p = [ $tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’), $tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’), $tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’), $tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’), $tu = array(‘sex’=>‘男’,‘height’=>‘170cm’,‘heavy’=>‘125’,‘name’=>‘吾志高’), ]; var_dump($p); var_dump($p[0]['sex']); //提取数组中的元素 //不能是var_dump($p[0][1]);

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