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php Loop - what is loop in php?

a loop is a sequence of instructions that is continually repeated until a certain condition is reached.

There are various type of loop statements in PHP.

  • while loop
  • do..while loop
  • for loop
  • foreach loop


    • while loop :

    while statement has three part of its structure. That is, initialization, conditional expression and statement to handle increments or decrements. This is shown as follows.
    initialization
    while(condition) {
    //set of expressions to be execute recursively
    ...
    increment (or) decrement
    }

    File name : index.php


    $i=1;
    while($i <= 3) {
    echo $i;
    $i++;
    }
    ?>

    Output :-

    1
    2
    3

    do while loop

    initialization
    do {
    //set of expressions to be execute recursively
    ...
    increment (or) decrement
    }while(condition)

    File name : index.php

    $i = 1;
    do {
    echo $i;
    $i++;
    } while (($i > 1) && ($i <= 3)); ?>

    Output :-

    1
    2
    3

    for loop

    for loop structure will facilitate the developer for easy understanding of code flow. Because, it holds all parts of a loop statement, that is, initialization, condition and increments/decrements part in one single statement. The syntax of for loop structure is as shown as below.

    syntax
    for(initialization; conditional statement; increments (or) decrements) {
    //set of expressions to be execute recursively
    }

    File name : index.php

    for($i=1;$i <= 3;$i++) {
    echo $i;
    }
    ?>

    Output :-

    1
    2
    3

    foreach loop

    foreach is used to organize an array with the key,value pair.

    File name : index.php

    foreach($array as $value_array) {}

    (or)

    foreach($array as $key_array=>$value_array) {}

    foreach example :

    File name : index.php

    $arr = array(1, 2, 3, 4);
    foreach ($arr as &$value) {
    $value = $value * 2;
    echo $value;
    }

    foreach example 2:

    File name : index.php

    $i=0;
    $data_array = array();
    $arr = array();
    foreach ($arr as &$row) {
    $data_array[$i]['id'] = $row[0]['id'];
    $data_array[$i]['name'] = $row[0]['name'];
    $data_array[$i]['address'] = $row[0]['address'];
    $data_array[$i]['pincode'] = $row[0]['pincode'];
    $i++;
    }

    Output :-


    example

    File name : index.php

    $name = array("Sara", "Arham", "Sana", "Kashaf");

    foreach ($name as $value) {
    echo "$value
    ";
    }
    ?>

    Output :-

    Sara
    Arham
    Sana
    Kashaf

    foreach example

    File name : index.php

    $input_array = array("Kashaf","Arham","Sana");
    foreach($input_array as $value) {
    $caps_value_array[] = ucfirst($value);
    }
    print "Getting Array Values";
    print "
    ";
    
print_r($caps_value_array);
    
print "
    ";
    ?>

    Output :-

    Getting Array Values
    Array
    (
    [0] => Kashaf
    [1] => Arham
    [2] => Sana
    )

    example

    File name : index.php

    $input_assoc_array = array("fruit1"=>"apple","fruit2"=>"orange","fruit3"=>"grapes");
    foreach($input_assoc_array as $key=>$value) {
    $caps_assoc_array[$key] = ucfirst($value);
    }
    print "Getting Array Values";
    print "
    ";
    
print_r($caps_assoc_array);
    
print "
    ";

    Output :-

    Getting Array Values
    Array
    (
    [fruit1] => Apple
    [fruit2] => Orange
    [fruit3] => Grapes
    )





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