I need to compare the array values with each other.These values are unique IDs. So, have to check whether ID values are repeated.
<?php
$id=array("firstid2012","secondid2014","thirddid2010","fourthid2014");
$idcount=count($id);
for($i=0;$i<$idcount;$i++){
//how to compare??
}
?>
If repeated id is true, then i have to change the value of that array value.So I need to know which array value is repeated also.
if (count($idvalues) == count(array_unique($idvalues))){
//ALL VALUES ARE DISTINCTS
}
else {
//THERE ARE DUPLICATED VALUES
$duplicated=array();
$visited=array();
foreach($idvalues as $value){
if (in_array($value,$visited)){
$duplicated[]=$value;
}
$visited[]=$value;
}
$duplicated=array_uniq($duplicated);
}
Some functions of interest to you:
array_unique: Remove duplicate values
http://php.net/manual/en/function.array-unique.php
array_intersect: Return values that occur in in more than one array.
This is the fastest way to get all the unique values from an array:
$unique = array_keys(array_flip($array));
In the backend it uses a hashmap, whereas if you use array_unique that just iterates over an over the array, which is very inefficient. The difference is in orders of magnitude.
You could use array_unique() to get an array of all unique values and then compare the size against the original array:
if (count(array_unique($submitted_genres)) !== count($submitted_genres)) {
// there's at least one dupe
}
You no need to run any loop for that just use array_unique(); i added fourthid2014 twice
$id[] = array("firstid2012", "secondid2014", "thirddid2010", "fourthid2014", "fourthid2014");
print_r($id[0]); // print it 5 values
$result = array_unique($id[0]);
print_r($result);// print it 4 values
You can use array_unique() function to remove duplicate values please refer this url for more info http://www.w3schools.com/php/func_array_unique.asp
A simple way would be
<?php
$id[]=$idvalues;
$idcount=count($id);
for($i=0;$i<$idcount;$i++){
for($ii=0; $ii<$idcount;$ii++)
{
if( $i != $ii ) //We don't want to compare the same index to itself
{
if( $id[$i] == $id[$ii] )
{
//Found same values at both $i and $ii
//As the code is here, each duplicate will be detected twice
}
}
}
?>
$idvalues? Can you give an example?$id = array("firstid2012","secondid2014","thirddid2010","fourthid2014");