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)

<?php $person = array("父亲","儿子","女儿"); echo $person[0]; //echo出数组中第一个元素； 
var_dump ($person[0]); //可以用var_dump遍历出整个数组，数组后面加编号就输出哪个元素 for($i = 0;$i

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

 }

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)

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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