PHP Loop Types

December 8, 2016 by pranjal

Filed under php

Last modified December 8, 2016

Loops in PHP are used to execute the same block of code a specified number of times. PHP supports following four loop types.
•for − loops through a block of code a specified number of times.
•while − loops through a block of code if and as long as a specified condition is true.
•do…while − loops through a block of code once, and then repeats the loop as long as a special condition is true.
•foreach − loops through a block of code for each element in an array.

for loop statement:
The for statement is used when you know how many times you want to execute a statement or a block of statements.
Syntax

for (initialization; condition; increment)
{
code to be executed;
}
The initializer is used to set the start value for the counter of the number of loop iterations. A variable may be declared here for this purpose and it is traditional to name it $i.

while loop statement:
The while statement will execute a block of code if and as long as a test expression is true.
If the test expression is true then the code block will be executed. After the code has executed the test expression will again be evaluated and the loop will continue until the test expression is found to be false.
Syntax
while (condition) {
code to be executed;
}
do…while loop statement:
The do…while statement will execute a block of code at least once – it then will repeat the loop as long as a condition is true.
Syntax
do {
code to be executed;
}
while (condition);

foreach loop statement:
The foreach statement is used to loop through arrays. For each pass the value of the current array element is assigned to $value and the array pointer is moved by one and in the next pass next element will be processed.
Syntax
foreach (array as value) {
code to be executed;
}

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