# Program To Find Prime Number in PHP

## A Program To Find Prime Number in PHP

A Prime Number is a whole number greater than 1 , which can only be divided by itself and 1. Some prime numbers are : 3, 5, 7, 11 ,13,17, 19 and 23. These numbers can only be divided by 1 and itself. For example 7 can only be divided by 1 and 7 hence it is a prime number. But 8 can be divide by 4 , 2 , 1 and itself. So it is not a prime number its composite number.

### Algorithm to Write Prime Number in PHP

There are many algorithms to write prime number in PHP. Here I am writing a simple algorithm.

### Algorithm

• Create a function.
• Get number from user to check.
• Divide number by 2 and store it in a variable name it resultant variable or whatever you like.
• Run for loop up to resultant .
• Inside for loop divide number by loop integers and assign each remainder to a variable.
• If any remainder is equal to zero it is not prime
• Else it is a prime number.

### Write a Program To Find Prime Number in PHP

``` function prime() //Create a Function { \$n=11; //Number to check \$a=\$n/2; for(\$i=2;\$i<=\$a;\$i++) { \$m=\$n%\$i; } if(\$m==0) { echo"is Not Prime"; } else { echo "Prime"; } } prime();```

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