php array form:
(1), numerical array
Shape: array(v1, v2, v3, v4,.....)
array(value 1, value 2, value 3, ...... ）
(2) Associative arrays
For example: array(k1=>v1,k2=>v2,k3=>v3,.......)
array(key 1 = > value 1, key 2 = > value 2, key 3 = > value 3,...... ）
(3), multi-dimensional data
$arr_arr = array(array(4567,77.7,99,100),"aa","bb",cc);
Data display:
print_r()
var_dump() (contains information such as type, length, etc.)
$arr = array(1,2,3,4,5);
print_r($arr);
echo "
";
var_dump($arr);
The result is:
Array( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5)
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5)}
Traversal of the array foreach ():
$arr = array(1,2,3,4,5);
foreach($arr as $k => $v){
echo "key => value is ".$k." =>".$v."
";
}
Output of a multidimensional array:
$arr_arr = array(array(4567,77.7,99,100),"aa","bb",cc);
echo "var_dump multidimensional arrays
";
var_dump($arr_arr);
echo "print_r() multidimensional array
";
print_r($arr_arr);
Display:
var_dump Multidimensional arrays
array(4) { [0]=> array(4) { [0]=> int(4567) [1]=> float(77.7) [2]=> int(99) [3]=> int(100) } [1]=> string(2) "aa" [2]=> string(2) "bb" [3]=> string(2) "cc"}print_r() Multidimensional array
Array( [0] => Array ( [0] => 4567 [1] => 77.7 [2] => 99 [3] => 100 ) [1] => aa [2] => bb [3] => cc)
Array functions:
delete function: unset($arr['k']);
Value sort: sort(), rsort() (reverse)
Key sort: ksort(), krsort()
Sum: array_sum ($array)
Number:count()sizeof()
Lookup: in_array(value,$array)
array_search(value,$array)
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Posted on 8/7/2019 6:06:34 AM
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Posted on 8/7/2019 8:30:11 AM