PHP Program to Find Prime Factor
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What is Prime Factor?
A Prime Factors of a given number is that any prime number other than 1 and itself that exactly divides the given number. For example, the prime factors of 60 is 2, 3, 5
Examples
The following table provides few examples of prime factors of a number.
| Number | Prime Factors |
|---|---|
| 55 | 5, 11 |
| 100 | 2, 5 |
| 186 | 2, 3, 31 |
Find Prime Factor
In the following example, we will find all the Prime factors of the given number (186).
Example
PHP Compiler
<?php
$num = 186;
$flag = 0;
for($i=2; $i<$num; $i++)
{
// check for divisibility
if($num % $i == 0)
{
$count = 0;
// check for prime number
for($j=1; $j<=$i; $j++)
{
if($i % $j == 0)
$count++;
}
if($count == 2)
{
if($flag == 0)
{
echo "Prime factor of $num: <br>";
$flag = 1;
}
echo "$i ";
}
}
}
if($flag == 0)
echo "There is no Prime factor for $num";
?>
Output
Prime factor of 186:
2 3 31
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