Instance 7: Array value basic operations
Copy Code code as follows:
<?php
$arr =array (' A ' => ' you ', ' B ' => ' me ', ' he ');
$arr []= "Other";
echo $arr [' B ']. <br> ";
$arr [' C ']= '];/to a null value, but still occupy the position of
echo Count ($arr). <br>;//The number of values in the array.
unset ($arr [' B ']);//This function can unregister the string, the entire array equivalence type, and the reference type.
Print_r ($arr);//This function prints the entire internal structure of a numeric value, reference type.
echo "<br>";
foreach ($arr as $key => $value)
echo $key. ":". $value. " <br>/Loops Output The value of the entire array.
?>
Instance 8: Converting between arrays and strings
Copy Code code as follows:
<?php
$arr =array (' A ' => ' you ', ' B ' => ' me ', ' he ');
echo $arr =implode ('-', $arr);//array-turn string, connector-
echo "<br>";
Print_r (Explode ('-', $arr, 2));//String to array. If the last parameter is not used, it means that all '-' are split into groups
?>
Instance 9: Array Ordering
Copy Code code as follows:
<?php
$arr =array (' B ' => ' You ', ' a ' => ' me ', ' he ');
Ksort ($arr);////array key value Pinyin (UTF-8 encoding) sorted, key values are not lost. Note that this sort does not return the new array, but instead directly passes the original array as a reference.
Print_r ($arr);
echo "<br>";
Asort ($arr);//arrays are sorted by value Pinyin (UTF-8 encoding) and key values are not lost. If you do not have a key value, you can use the function sort () and if the reverse sequence also has a function rsort (). Note that this sort does not return the new array, but instead directly passes the original array as a reference.
Print_r ($arr);
echo "<br>";
$arr =array (10000,100,1000);
Natsort ($arr);//To naturally sort values by number, while Natcasesort () is case-insensitive
Print_r ($arr);
echo "<br>";
Print_r (Array_reverse ($arr));//Array reverse order
echo "<br>";
?>
Example 10: Array, digital random extraction, digital and coded conversions
Copy Code code as follows:
<?php
$arr =array (' B ' => ' You ', ' a ' => ' me ', ' he ');
$key =array_rand ($arr, 2);//array randomly extracts 2 key values and returns an array of two key values
echo $arr [$key [0]]. $arr [$key [1]];
echo "<br>";
echo Mt_rand (60,100);//returns a random integer within the range.
echo "<br>";
Echo Chr (Mt_rand (Ord (' A '), Ord (' Z '));/number and encoding conversion.
echo "<br>";
?>
The function of the array is finished, I only pick a few representative to let you get started, in fact, there are some less commonly used array functions. In addition, we can use a for or a foreach loop to process the array, generate their own my_ function, stupid method.
