 # PHP Program to print n prime numbers

## What is a Prime Number & Composite Number?

Prime numbers are natural numbers that are greater than 1 that are not a product of two smaller natural numbers.  Prime numbers are natural numbers that are greater than 1 that are not a product of two smaller natural numbers. Composite numbers are natural numbers greater than 1 and which are not prime numbers. For example, 7 has no divisors other than 1 and 7 itself which is a prime number and   has more than two divisors which is a composite number.

## How to n prime numbers using PHP?

In PHP to check whether the number is Prime by using Mod(%) Operator and if we get 0 except by 1 and the number itself, it won't be a prime number. In this program, we first have to accept the limit from the user and assign it to the variable and assign the value 0 into the variable ct and value 2 into the variable num. Then perform the `while` loop until the condition 'ct < n'  becomes false and in the block of the loop we have to assign the value 0 into the variable dCt. And then assign the value 2 into the variable i perform the `for` loop until the condition 'i <= num' becomes false and increment the value of the i in every iteration in the block of the loop we have to check the condition 'num % i == 0' if tru increment the value of the variable dCt. And after the completion of the `for` loop, we have to check the condition 'dCt == 1' if true print the value of the variable num and also increment the value of the variable ct and increment the value of the variable num.

### ALGORITHM

Step 1: Accept the limit from the user and assign it to the variable n

Step 2: Assign the value 0 into the variable ct and value 2 into the variable num

Step 3: Perform the following Steps until the condition 'ct < n'  becomes false

Step 4: Assign the value 0 into the variable dCt

Step 5: Assign the value 2 into the variable i perform the following sub-step until the condition 'i <= num' becomes false and increment the value of the i in every iteration

(i) Check the condition 'num % i == 0' if tru increment the value of the variable dCt

Step 6: Check the condition 'dCt == 1' if true print the value of the variable num and also increment the value of the variable ct

Step 7: Increment the value of the variable num

## PHP Source Code

```                                          ```<?php
\$n = readline("Enter the limit of number required: ");
\$ct = 0;
\$num = 2;
while (\$ct < \$n) {
\$dCt = 0;
for (\$i = 2; \$i <= \$num; \$i++) {
if ((\$num % \$i) == 0) {
\$dCt++;
}
}
if (\$dCt == 1) {
echo \$num . "  ";
\$ct++;
}
\$num++;
}
?>```
```

## OUTPUT

```Enter the limit of number required: 15
2  3  5  7  11  13  17  19  23  29  31  37  41  43  47```
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