Loops PHP 04

PHP Course
PHP Course Info@ITBigDig.com
Loops

Instructor
 Name: Mohamed Saad.
 Email: Engsaad_aly@hotmail.com
 Occupation: Web Developer In IT Big Dig.

Contents
• PHP Array Functions
o while - loop
o do...while
o for - loop
o foreach

while - loop
•Loops through a block of code while a specified condition is true.
do...while
•Loops through a block of code once, and then repeats the loop as
long as a specified condition is true.
for - loop
•Loops through a block of code a specified number of times.
foreach
•Loops through a block of code for each element in an array.

while - loops
Syntax
o while (condition)
{
code to be executed;
}

<html>
<body>
<form action="while_loop.php" method="post">
Enter any number less than 10000:<input type="text" name="x"/>
<input type="submit" name="submit" value="Go"/>
</form>
</body>
</html>
<?php
if (empty($_POST)===false)
{
$x=$_POST['x'];
if ($x<10000){
$i=1;
while($i<=$x)
{
echo $i . "<br>";
$i++;
}
}//end of nasted if
else{echo "You entered invalid value";}
}//end of empty($_POST)
?>
Copy Code
while_loop.php

For Loop
Syntax
o for (Counter; condition; increment)
{
}

<html>
<body>
<form action="for_loop.php" method="post">
</form>
</body>
</html>
<?php
{
$x=$_POST['x'];
if ($x<10000){
for ($i=1; $i<=$x; $i++)
{
echo $i . "<br>";
}
}//end of nested if
?>
Copy Code
For_loop.php

Insert number and you will get
textboxes equals that number

<html>
<body>
</form>
<?php
{
$x=$_POST['x'];
if ($x<10000){
for ($i=1; $i<=$x; $i++)
{
?>
<input type="text" name="<?php $i; ?>" value="<?php echo $i; ?>"/>
<?php
}
}//end of nested if
?>
</form>
</body>
</html>
Copy Code
For_loop.php

do...while Statement
Syntax
o do
{
}
while (condition);

For Each
• When foreach first starts executing, the internal
array pointer is automatically reset to the first
element of the array.
• In order to be able to directly modify array elements
within the loop precede &$value.

<pre>
<?php
$x = array(1, 2, 3, 4);
print_r($x);
echo "<br>";
foreach ($x as &$value) {
$value = $value * 2;
echo $value;
echo "<br>----------<br>";
}
//unset or it will equal 8
unset($value);
print_r($x);
?>
</pre>
Copy Code
foreeach.php

This will not work
<?php
foreach (array(1, 2, 3, 4) as &$value)
{
$value = $value * 2;
}
?>
We have to create
variable first.
Info@ITBigDig.com

We hope You enjoy This Tutorial.
For any Suggestions Please Email Us
Info@ITBigDig.com
End
Loops

Loops PHP 04

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