2018-10-12 15:37:13 -04:00
										 
									 
								 
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								---
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											2018-12-29 16:24:19 -05:00
										 
									 
								 
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								title: Loops
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								---
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								# PHP Loops
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								When you need to repeat a task multiple times, you can use a loop instead of adding the same code over and over again.
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								PHP has the following loop statements :
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								- for - loop through a block of code with specific number of times.
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								- while - loop through a block of code if condition is true.
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								- do...while - loop through a block of code one and continue loop if condition is true.
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								- foreach - loop through a block of code for each value within an array.
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								Using a `break` within the loop can stop the loop execution.
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								# For loop
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								Loop through a block of code with specific number of times.
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								## Syntax
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											2018-11-18 06:31:26 +02:00
										 
									 
								 
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								```php
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								for (init counter; condition; counter increment or decrement)
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								{
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								    // Code to be executed
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								}
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								```
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								## Example
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								```php
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								<?php
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								for($index = 0; $index < 5; $index ++)
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								{
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								    echo "Current loop counter ".$index.".\n";
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								}
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								?>
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								```
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								## Output
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								```
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								> Current loop counter 0.
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								> Current loop counter 1.
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								> Current loop counter 2.
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								> Current loop counter 3.
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								> Current loop counter 4.
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								```
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								# While loop
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								Loop through a block of code if condition is true.
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								## Syntax
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											2018-11-18 06:31:26 +02:00
										 
									 
								 
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								```php
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								while (condition)
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								{
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								    // Code to be executed
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								}
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								```
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								## Example
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								```php
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								<?php
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								$index = 10;
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								while ($index >= 0)
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								{
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								    echo "The index is ".$index.".\n";
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								    $index--;
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								}
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								?>
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								```
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								## Output
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								```
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								> The index is 10.
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								> The index is 9.
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								> The index is 8.
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								> The index is 7.
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								> The index is 6.
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								> The index is 5.
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								> The index is 4.
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								> The index is 3.
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								> The index is 2.
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								> The index is 1.
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								> The index is 0.
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								```
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								# Do...While loop
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											2018-12-30 03:20:25 +05:30
										 
									 
								 
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								Loop through a block of code once and continue to loop if the condition is true.
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								## Syntax
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											2018-11-18 06:31:26 +02:00
										 
									 
								 
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								```php
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								do
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								{
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								    // Code to be executed
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								}
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								while (condition);
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								```
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								## Example
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								```php
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								<?php
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								$index = 3;
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								do
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								{
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								    // execute this at least 1 time
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								    echo "Index: ".$index.".\n"; 
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								    $index --;
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								}
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								while ($index > 0);
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								?>
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								```
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								## Output
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								```
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								> Index: 3.
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								> Index: 2.
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								> Index: 1.
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								```
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								# Foreach loop
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								Loop through a block of code for each value within an array.
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								## Syntax
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											2018-11-18 06:31:26 +02:00
										 
									 
								 
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								```php
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											2018-10-12 15:37:13 -04:00
										 
									 
								 
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								foreach ($array as $value)
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								{
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								    // Code to be executed
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								}
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								```
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								## Example
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								```php
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								<?php
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								$array = ["Ali", "Ah Kao", "Muthu", "Gwen", "Lucida", "Cecily", "Arthur", "Flora"];
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								foreach ($array as $name)
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								{
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								    echo "Hi, my name is ".$name.".\n"; 
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								    if ($name == "Cecily")
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								    {
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								        echo "\"Hello, ".$name."!\"";
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								        // stop the loop if name is Cecily
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								        break;
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								    }
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								}
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								?>
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								```
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								## Output
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								```
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								> Hi, my name is Ali.
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								> Hi, my name is Ah Kao.
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								> Hi, my name is Muthu.
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								> Hi, my name is Gwen.
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								> Hi, my name is Lucida.
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								> Hi, my name is Cecily.
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								> "Hello, Cecily!"
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								```
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											2018-12-29 23:24:53 +02:00
										 
									 
								 
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								## For More Information:
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								http://php.net/manual/en/control-structures.for.php
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