PHP数组的基本操作及遍历数组的经典操作实例
实例如下所示:
<?php 索引数组 //数组第一种定义 $arr = array(1,2,3); var_dump($arr); //数组第二种定义 $arr = [1,2,3]; var_dump($arr); //数组第三种定义 $arr[0] = 7; $arr[1] = "hello"; var_dump($arr); echo $arr[2];//取值 关联数组 $arr = array("name"=>"小李","sex"=>"女","age"=>"20"); echo $arr["sex"]; 遍历数组 //for循环遍历 适用于索引数组 $arr = [1,5,6,9,4,6,8]; for($i=0;$i<count($arr);$i++){ echo $arr[$i].'<br>'; } ; //foreach循环遍历 适用于索引和关联数组 $arr = array("name"=>"小李","sex"=>"女","age"=>"20"); foreach($arr as $k=>$v){ //echo $k.':'.$v.'<br>'; echo "{$k}:{$v}<br>"; }; $arr = [1,5,6,9,4,6,8]; foreach($arr as $k){ echo $k.'<br>'; }; $arr = array("name"=>"小李","sex"=>"女","age"=>"20"); var_dump(each($arr)); list($a,$b) = array(name,小李); echo "{$a},{$b}"; list和each结合遍历 /* $arr = array("name"=>"小李","sex"=>"女","age"=>"20"); while(list($k,$v)=each($arr)){ echo "{$k}:{$v}<br>"; } */ 指针遍历 /* $arr = array("name"=>"小李","sex"=>"女","age"=>"20"); echo current($arr);//取value echo key($arr);//取key next($arr); echo current($arr); echo key($arr); prev($arr); echo current($arr); echo key($arr); end($arr); echo current($arr); echo key($arr); reset($arr); echo key($arr).':'.current($arr).'<br>'; */
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