PHPの配列操作の使用法の概要

 a[1] => b[2] => c[3] => d) $numbers = range(1,5);//创建一个包含指定范围的数组 print_r($numbers);//Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) print_r(true);//1 var_dump(false);//bool(false)//print_r可以把字符串和数字简单地打印出来，数组会以Array开头并已键值形式表示，print_r输出布尔值和null的结果没有意义，因此用var_dump更合适

for($i = 0 ;$i < 5;$i++){ echo $users[$i]; echo '
'; }

for($i = 0; $i < count($users);$i++){ echo $users[$i]; echo '
'; }

foreach($users as $value){ echo $value.'
';//点号为字符串连接符号 } //foreach循环遍历 $key => $value；$key和$value是变量名，可以自行设置 foreach($users as $key => $value){ echo $key.'
';//输出键 } ?>

1,"b"=>2,"c"=>3,"d","e"]; //如果没有声明键，它会从零开始 print_r($array);//array([a]=>1,[b]=>2,[c]=>3,[0]=>d,[1]=>e); ?>

';//Array //因为相关数组的索引不是数字，所以无法通过for循环来进行遍历操作，只能通过foreach循环或list()和each()结构 //each的使用 //each返回数组中当前的键/值对并将数组指针向前移动一步 $users = array('key'=>22,'key1'=>20,'key2'=>30); //print_r(each($users));//Array ( [1] => 22 [value] => 22 [0] => array[key] => array) //相当于：$a = array([0]=>array,[1]=>22,[value]=>22,[key]=>array); $a = each($users);//each把原来的数组的第一个元素拿出来包装成新数组后赋值给$a echo $a[0];//array //!!表示将真实存在的数据转换成布尔值 echo !!each($users);//1 ?>

';//2 echo $var2;//abc $a = ['name'=>'trigkit4','age'=>22,'0'=>'boy']; //list只认识key为数字的索引 list($var1,$var2) = $a; echo $var1;//boy ?>

 100 [1] => 2 ) $arr = array('trigkit4','banner','10'); sort($arr,SORT_STRING); print_r($arr);//Array ( [0] => 10 [1] => banner [2] => trigkit4 ) shuffle($arr); print_r($arr);//随机排序 $array = array('a','b','c','d','0','1'); array_reverse($array); print_r($array);//原数组的反向排序。 Array ( [0] => a [1] => b [2] => c [3] => d [4] => 0 [5] => 1 ) ?>

$arr1 = array( '10' , 2); $arr2 = &$arr1 ; $arr2 [] = 4 ; // $arr2 被改变了,$arr1仍然是array('10', 3) print_r($arr2);//Array ( [0] => 10 [1] => 2 [2] => 4 )

$arr3 = & $arr1 ;//现在arr1和arr3是一样的 $arr3 [] = '3' ; asort($arr3);//对数组进行排序并保留原始关系 print_r($arr3);// Array ( [1] => 2 [2] => 3 [0] => 10 )

$fruits = array('c'=>'banana','a'=>'apple','d'=>'orange'); ksort($fruits); print_r($fruits);//Array ( [a] => apple [c] => banana [d] => orange )

array_unshift($array,'z');//开头处添加一元素 print_r($array);//Array ( [0] => z [1] => a [2] => b [3] => c [4] => d [5] => 0 [6] => 1 )

echo current($array);//z;获取当前数组中的当前单元

echo next($array);//a;将数组中的内部指针向前移动一位

echo reset($array);//z;将数组内部指针指向第一个单元

echo next($array);//a; echo prev($array);//z;倒回一位

//sizeof的使用 echo sizeof($array);//7；统计数组元素的个数 //array_count_values $num = array(10,20,30,10,20,1,0,10);//统计数组元素出现的次数 print_r(array_count_values($num));//Array ( [10] => 3 [20] => 2 [30] => 1 [1] => 1 [0] => 1 ) ?>

10,2=>20,3=>30); $num = array_pad($num,4,40); print_r($num);//Array ( [0] => 10 [1] => 20 [2] => 30 [3] => 40 ) $num = array_pad($num,-5,50);//array_pad(array,size,value) print_r($num);//Array ( [0] => 50 [1] => 10 [2] => 20 [3] => 30 [4] => 40 ) ?>

 8 [1] => 8 [2] => 8 [3] => 8 [4] => 8 ) echo '
'; unset($num[3]); print_r($num);//Array ( [0] => 8 [1] => 8 [2] => 8 [4] => 8 ) ?>

'; print_r($arrayFilled); ?>

 I [2] => Am [3] => A [4] => PHP [5] => er ) ?>

 red [1] => green [2] => blue [3] => yellow ) ?>

"; $array = array_flip($array);// print_r($array);//Array ( [red] => 2 [blue] => 1 [Black] => 3 ) ?>