This time I will bring you PHP to determine repeated values in an array. What are theprecautions for PHP to determine repeated values in an array? The following is a practical case, let's take a look.
Suppose there are several values in an array $a. How to determine whether there are the same values among these values?Using
php arrayfunctionarray_unique, you can easily solve this problem.
array_unique(PHP 4 >= 4.0.1, PHP 5)
Description
array array_unique ( array array )
Note that the key name remains unchanged. array_unique() first sorts the values as
string, then retains only the first encountered key name for each value, and then ignores all subsequent key names. This does not mean that the first occurrence of the same value in an unsorted array will be preserved.Note: Two units are considered the same if and only if (
string) $elem1 === (string) $elem2. That is, when the expressions of the strings are the same.The first unit will be retained.
"green", "red", "b" => "green", "blue", "red"); $result = array_unique($input); print_r($result); ?>
Array ( [a] => green [0] => red [1] => blue )
array(2) { [0] => int(4) [2] => string(1) "3" }
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