This time I will bring you a detailed explanation of the steps to obtain duplicate data in an array in PHP. What are the precautions for obtaining duplicate data in an array in PHP? Here are practical cases, let's take a look.
Requires finding duplicate data in PHP arrays, and summarizes two methods. 1, use the functions provided by php,array_unique and array_diff_assoc to achieve this.
<?php
function FetchRepeatMemberInArray($array) {
// 获取去掉重复数据的数组
$unique_arr = array_unique ( $array );
// 获取重复数据的数组
$repeat_arr = array_diff_assoc ( $array, $unique_arr );
return $repeat_arr;
}
// 测试用例
$array = array (
'apple',
'iphone',
'miui',
'apple',
'orange',
'orange'
); www.jbxue.com
$repeat_arr = FetchRepeatMemberInArray ( $array );
print_r ( $repeat_arr );
?>Custom function realize this function, using two for loops
<?php
function FetchRepeatMemberInArray($array) {
$len = count ( $array );
for($i = 0; $i < $len; $i ++) {
for($j = $i + 1; $j < $len; $j ++) {
if ($array [$i] == $array [$j]) {
$repeat_arr [] = $array [$i];
break;
}
}
}
return $repeat_arr;
}
// 测试用例
$array = array (
'apple',
'iphone',
'miui',
'apple',
'orange',
'orange'
);
$repeat_arr = FetchRepeatMemberInArray ( $array );
print_r ( $repeat_arr );
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