Split a string and store into an array

19. August 2010 · 31 comments · Categories: PHP SCRIPTS

This PHP script code is for split a string into the specified length and store it into an array. Here we are using a form to enter the string to split , length at which split process and the cut mode . In normal cut modes split wont happen in the middle of a single word , in strict mode split will happen strictly even in the middle of a single word.

<html>
<head>
</head>
<body>
<form name="split" action="" method="post">
Enter the string to Split
<input type="text" name="text1" /><br />
Enter the character length to split:<input type="text" name="len1" /><br />
Cut Mode;<select name="cut">
<option value=0 t>Normal Cut</option>
<option value=1>Strict Cut</option>
</select><br>
<input type="submit" value="split" name="btnsubmit" />

</form>
<?php
if(isset($_POST['btnsubmit']))
{
$text=$_POST['text1'];
$len1=$_POST['len1'];
$mode=$_POST['cut'];
//echo "Original String ".$text;
//$count= strlen($text);
$newtext = wordwrap($text, $len1, "<***>",$mode);
$result=explode('<***>', $newtext);
$count= count($result);
$i=0;
while ($i<$count)
{
echo "String ".$i." is : <b>".$result[$i]."</b><br>";
$i=$i+1;
}
}
?>
</body>
</html>

Here you can watch this script in action VIEW

A Prime Number list generation PHP script

18. August 2010 · 1 comment · Categories: PHP SCRIPTS

A prime number is defined as a number which can be only divisible by 1 and that number itself. That number cannot be divisible by any other number. So if we try to divide that number by any other number between one and that number , we will get a remainder. According to the prime number definition number one ( 1 ) wont consider as a primer number. The smallest primer number is 2 .

See is a list of primer number below 50
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,

Here is a sample PHP script program to create a list of prime numbers
In this example we are going to print first 20 prime numbers.

<?php
$count = 0 ;
$number = 2 ;
while ($count < 20 )
{
$div_count=0;
for ( $i=1;$i<=$number;$i++)
{
if (($number%$i)==0)
{
$div_count++;
}
}
if ($div_count<3)
{
echo $number." , ";
$count=$count+1;
}
$number=$number+1;
}
?>

Its output will be :

2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41 , 43 , 47 , 53 , 59 , 61 , 67 , 71 ,

Logic of this program : We need first store the current number to a variable. And then we will find the remainder for each division of other numbers with the stored number using a loop. And we will increment a counter if remainder found zero. After all the division operations with other numbers we will check the total counter for the remainder. If its value greater than two means , that number can be divisible by some other number instead of 1 and that number itself.If its value less than three means , its a primer number.

Now look at another PHP script for generating a list of prime numbers below 100.

<?php
$number = 2 ;
while ($number < 100 )
{
$div_count=0;
for ( $i=1;$i<=$number;$i++)
{
if (($number%$i)==0)
{
$div_count++;
}
}
if ($div_count<3)
{
echo $number." , ";
}
$number=$number+1;
}
?>

Its output will be ;

2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41 , 43 , 47 , 53 , 59 , 61 , 67 , 71 , 73 , 79 , 83 , 89 , 97 ,

This not only the one method of logic to create Primer number series .. You can create the list other methods and loops in PHP.

PHP Fibonacci Series printing

18. August 2010 · 41 comments · Categories: PHP SCRIPTS

A Fibonacci Series of numbers will look like
0 , 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55

First two Fibonacci numbers are 0 and 1 . After that each number will be the sum of previous two numbers . Here we can see that third Fibonacci number is 1 ( sum of first two numbers 0 + 1 ) , and fourth Fibonacci number will be the sum of third and second number ( 1 + 1 = 2 ) , and fifth Fibonacci number will be the sum of fourth and third number ( 2 + 1 = 3 ). The series will go like that infinity .

Now we can learn how to make a Fibonacci series using PHP .
Here is the PHP script for printing first 20 Fibonacci numbers .

<?php
$count = 0 ;
$f1 = 0;
$f2 = 1;
echo $f1." , ";
echo $f2." , ";
while ($count < 20 )
{
$f3 = $f2 + $f1 ;
echo $f3." , ";
$f1 = $f2 ;
$f2 = $f3 ;
$count = $count + 1;
}
?>

Its output will be :

0 , 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , 144 , 233 , 377 , 610 , 987 , 1597 , 2584 , 4181 , 6765 , 10946 ,

In this example I have created the series using a while loop .Like this we can make Fibonacci Series using for loops also in PHP .