 # PHP Program to separate the odd and even numbers in an array

## How do we separate odd and even numbers in the array?

In this program, we are separating the odd and even numbers in the given array. Odd numbers are those numbers when operate by Mod(%) 2 and the remainder will be non 0 and when the remainder will be 0 then the number will be an Even number. For example, if the entered number is 8 and when '8 % 2' is calculated and the result will be 0 so it is an even number, and if the entered number is 7 and when '7 % 2' is calculated the result will be 1 so it is an odd number. After finding the odd and even we assign them in different arrays.

## How do we separate odd and even number in an array using PHP?

For this program to separate the odd and even elements in the array, we are taking the static values which are assigned to the array arr[]. After that, we assign two empty arrays oddArray[] and evenArray[] to store the odd and even numbers separately. Then we have to assign the size of the array into the variable size by using the built-in function `count()`. Then we can print the elements of the array arr[] using `for loop`. Now we have to assign the value 0 into the variables j and k. After that assign the value 0 into the variable i and perform the loop until the condition 'i < size' becomes false and increment the value of variable i in every iteration and in the block of the loop we have to check the condition 'arr[i] % 2 == 0' if true then assign the value of arr[i] into the array evenArray[j] and increment the value of j otherwise assign the value of arr[i] into the array oddArray[k] and increment the value of k. After the completion of the loop, we can print the elements of the array evenArray[] as the array with even numbers and elements of the array oddArray[] as the array with the odd numbers.

### ALGORITHM

Step 1: Initialize an array a[] with values

Step 2: Assign two empty arrays oddArray[] and evenArray[] to store the odd and even numbers separately

Step 3: Assing the size of the array into the variable size using the built-in function `count()`

Step 4: Print the elements of the array arr[] using `for loop`

Step 5: Assign the value 0 into the variables j and k

Step 6: Assign the value 0 into the variable i and perform the sub-step until the condition 'i < size' becomes false and increment the value of variable i in every iteration

(i) Check the condition 'arr[i] % 2 == 0' if true then assign the value of arr[i] into the array evenArray[j] and increment the value of j otherwise                      perform the sub-step ii

(ii) Assign the value of arr[i] into the array oddArray[k] and increment the value of k

Step 7: Print the elements of array evenArray[] using for loop as the even numbers

Step 8: Print the elements of array oddArray[] using for loop as the odd numbers

## PHP Source Code

```                                          ```<?php
\$arr = array(1, 2, 3, 4, 5, 6, 7, 8, 9);
\$oddArray = array();
\$evenArray = array();
echo "Orginal array: \n";
\$size = count(\$arr);
for (\$i = 0; \$i < \$size; \$i++) {
echo "\$arr[\$i] ";
}
\$j = 0;
\$k = 0;
for (\$i = 0; \$i < \$size; \$i++) {
if (\$arr[\$i] % 2 == 0) {
\$evenArray[\$j] = \$arr[\$i];
\$j++;
} else {
\$oddArray[\$k] = \$arr[\$i];
\$k++;
}
}
echo "\nArray of even numbers : \n";
for (\$i = 0; \$i <= \$j; \$i++) {
echo "\$evenArray[\$i] ";
}
echo "\nArray of odd numbers : \n";
for (\$i = 0; \$i <= \$k; \$i++) {
echo "\$oddArray[\$i] ";
}
?>```
```

## OUTPUT

```Orginal array:
1 2 3 4 5 6 7 8 9
Array of even numbers :
2 4 6 8
Array of odd numbers :
1 3 5 7 9```
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