數組函數
1–count 數組長度
$array1 = array(1,2,3,4);
$length = count($array1);
print_r($length);
打印結果爲:
4
注意 : php打印字符串需要用print_r;
2–array_shift 從數組中刪除第一個元素,並返回
$array1 = array(1,2,3,4);
$arr = array_shift( $array1);
print_r($arr);
print_r($array1);
打印結果爲:
1
Array ( [0] => 2 [1] => 3 [2] => 4 )
3–array_unshift 從數組的頭部壓入一個新單元,然後返回數組新的長度
–eg1:
$array1 = array(1,2,3,4);
$newarr = array(“a”,“b”);
$array = array_unshift($newarr,$array1);
print_r($array);
print_r($newarr);
print_r($array1);
打印結果爲:
3
Array ( [0] => Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) [1] => a [2] => b )
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )
–eg2:
$newarr = array(“a”,“b”);
$count = array_unshift($newarr,“abc”);
print_r($count);
print_r($newarr);
打印結果爲:
3
Array ( [0] => abc [1] => a [2] => b )
4–array_pop 從尾部彈出一個單元格,並返回被彈出的單元
$array1 = array(1,2,3,4);
$arr = array_pop($array1);
print_r($arr);
print_r($array1);
打印結果爲:
4
Array ( [0] => 1 [1] => 2 [2] => 3 )
5–array_push 從尾部壓入一個單元格,返回的是新數組的長度 ( 數組操作是引用傳值 )
$array1 = array(1,2,3,4);
$count = array_push($array1,“aaa”);
print_r($array1);
print_r($count);
打印結果爲:
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => aaa )
5
6–array_merge 將一個或多個數組的單元合併起來,一個數組中的值附加在前一個數組的後面,返回作爲結果的數組。
–如果輸入的數組中有相同的字符串鍵名,則該鍵名後面的值將覆蓋前一個值。
–然而,如果數組包含數字鍵名,後面的值將不會覆蓋原來的值,而是附加到後面。
–如果只給了一個數組並且該數組是數字索引的,則鍵名會以連續方式重新索引。
eg1:
$array1 = array(“1”,“2”,“3”);
$array2 = array(“4”,“5”,“6”);
$array = array_merge($array1,$array2);
print_r($array);
打印結果爲:
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
eg2:
$array1 = array(“1”,“2”,“3”);
$array2 = array(“3”,“5”,“6”);
$array = array_merge($array1,$array2);
print_r($array);
打印結果爲:
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 3 [4] => 5 [5] => 6 )
eg3:
$array1 = array(“one”=>“1”,“two”=>“2”,“three”=>“3”);
$array2 = array(“one”=>“3”,“two”=>“5”,“three”=>“6”);
$array = array_merge($array1,$array2);
print_r($array);
打印結果爲:
Array ( [one] => 3 [two] => 5 [three] => 6 )
eg4:
$array1 = array(“one”=>“1”,“two”=>“2”,“three”=>“3”);
$array2 = array(“one”=>“3”,“two”=>“5”,“four”=>“3”);
array1,$array2);
print_r($array);
打印結果爲:
Array ( [one] => 3 [two] => 5 [three] => 3 [four] => 3 )
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