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Hello Friends,
I am newbie in PHP. I have done C and C++ programming language little bit. I want to use the For Loop in PHP but I don't know how to use.!Do we have to set a counter variable to some initial value for doing the For Loop in PHP.?? Does anyone know how to use For Loop in PHP? Please help me to sort out my doubt.!
"Every man is guilty of all the good he did not do". - Voltaire
Member
Since you have done C and C++ programming language, you should know why we use the For Loop in PHP. Because the concept are same. Also you have to set a counter variable to some initial value for doing the For Loop in PHP. Here are some common tasks that are covered by a for loop are :
- Set a counter variable to some initial value.
- Execute the code within the loop.
- Check to see if the conditional statement is true.
- Increment a counter at the end of each iteration through the loop.
The for loop allows you to define these steps in one easy line of code.
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If you know how many times the script should run before writing the code, then you can use the for loop. The Syntax of For Loop :
The For Loop takes the following parameters :PHP Code:for (init; condition; increment)
{
code to be executed;
}
- condition : this parameter evaluates for each loop iteration. If it evaluates to TRUE, the loop continues. If it evaluates to FALSE, the loop ends.
- init : This is mostly used to set a counter.
- increment : This is used to increment a counter.
Member
By looking at the following example I think that your doubt will be solved.!! In the example below the loop that is defined, starts with i=1. The loop will continue to run as long as i is less than, or equal to 7. i will increase by 1 each time the loop runs :
The output of the above coding will be :PHP Code:<html>
<body>
<?php
for ($i=1; $i<=7; $i++)
{
echo "The number is " . $i . "<br />";
}
?>
</body>
</html>
Code:The number is 1 The number is 2 The number is 3 The number is 4 The number is 5 The number is 6 The number is 7
Member
The basic structure of the for loop is as follows :
You should note that each step is separated by a semicolon: initiliaze counter, conditional statement, and the counter increment. Since the semicolon are separate expressions, so they are needed. Also note that a semicolon is not needed after the "increment counter" expression. These are some common mistakes made by the beginners. So avoid making such mistakes.PHP Code:for ( initialize a counter; conditional statement; increment a counter){
do this code;
}
Member
You can also use the foreach loop in PHP. The foreach loop is used to loop through arrays. The below coding is an example of the foreach loop :
The output of the above code will be :PHP Code:<html>
<body>
<?php
$x=array("red","green","blue");
foreach ($x as $value)
{
echo $value . "<br />";
}
?>
</body>
</html>
Code:red blue green
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