【Php】数组遍历，foreach, each, trim()

<?php
	$iplist = "122.224.251.154|192.168.2.138|192.168.2.12";
	echo $_SERVER['REMOTE_ADDR'] . "<br/>";
	$arr = explode('|', $iplist);	// 将iplist用'|'分割

	echo "<br/>";
	print_r($arr);
	echo "<br/>";
	foreach($arr as $key => $ip)	// 遍历数组1
	{
		echo "$key = $ip<br/>";
	}

	echo "<br/>";
	reset($arr);					// 重置arr数组指针
	print_r($arr);
	echo "<br/>";
	while (list($key, $val) = each($arr))	// 遍历数组2
	{
		echo "$key = $val<br/>";
	}

	echo "<br/>";
	$str = "    hello world  
		  ";
	$str = trim($str);				// trim()
	echo "#$str#<br/>";

	echo "<br/>";
	$arr = array(1, 2, array('hello', 'world', 33), 66, 'come on');
	print_r($arr);					// 打印嵌套数组
	echo "<br/>";
	
	echo "<br/>";
	$arr = array(
		'name' => 1,
		'nick' => 2, 
		'arr' => array('hello', 'world', 33),
		66,
		'come on'
		);							// 这种方式的数组相当于json/dict格式了
	print_r($arr);
	echo "<br/>";
?>