Creation and traversal of arrays in php

The establishment of arrays in php can be divided into 3 types of methods. When traversing the array, we will often use the count($arr) function. This function returns the length of the array:

1.

//数组创建的第一种方法
	$arr[0] = 11;
	$arr[1] = "ee";
	$arr[2] = 11.1;
	$arr[3] = true;
	$arr[4] = null;
	for($i = 0; $i < count($arr); $i++) {
		echo &#39;<br/>'.$arr[$i];
	}

2.

//数组创建的第二种方法
	$arr = array(1,"ee",true);
	for($i = 0; $i < count($arr); $i++) {
		echo &#39;<br/>'.$arr[$i];
	}

3.

//数组创建的第三种方法（以键值对的方式进行存储）
	$arr['name'] = "raid";
	$arr['pwd'] = "eee";
	foreach($arr as $key=>$val) {
		echo $key."=".$val."<br/>";
	}

4. Sometimes it can also be written like this:

$arr = array(5=>"logo","ee"=>12,"ff"=>13);
	//显示整个数组的情况
	print_r($arr);
	echo "<br/>";
	var_dump($arr);
	echo "<br/>".is_array($arr);

In order to split the string into an array, we can use the following explode method:

$str = "e a d d";
	$arr = explode(" ", $str);
	foreach($arr as $key=>$val) {
		echo "<br/>".$key."=".$val;
	}

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The above introduces the creation and traversal of arrays in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.