Numeric Arrays vs Associative Arrays in Web Technology
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Questions and Answers

In PHP, which syntax is used to access both keys and values while traversing an array using a foreach loop?

  • $foreach ($array_name as $value => $key) { //foreach block }
  • $foreach ($array_name as $value) { //foreach block }
  • $foreach ($array_name as $key) { //foreach block }
  • $foreach ($array_name as $key => $value) { //foreach block } (correct)

    • What does a user-defined function in PHP represent?

  • A PHP reserved keyword
  • A single line of code
  • A function specific to arrays only
  • A block of statements that can be reused in a program (correct)

    • How would you access only values while traversing an array with a foreach loop in PHP?

  • $foreach ($array_name as $key => $value) { //foreach block }
  • $foreach ($array_name as $value => $key) { //foreach block }
  • $foreach ($array_name as $key) { //foreach block }
  • $foreach ($array_name as $value) { //foreach block } (correct)

    • In PHP, what is the purpose of the '=> ' operator when traversing an array with a foreach loop?

    <p>To separate the key and value pairs</p> Signup and view all the answers

    Which type of statements can be grouped together to create a user-defined function in PHP?

    <p>A block of related statements</p> Signup and view all the answers

    What is the main benefit of using a foreach loop to access elements of an array in PHP?

    <p>It simplifies accessing array values without using indexes</p> Signup and view all the answers

    Which of the following is NOT a correct step when using a foreach loop with arrays in PHP?

    <ul> <li>Use 'key' instead of 'value' to access elements</li> </ul> Signup and view all the answers

    Study Notes

    Numeric Arrays

    • In numeric arrays, the index is represented by numbers.
    • If keys are not defined, the array function automatically assigns numeric keys starting from 0 in incremental order.
    • Example: array (size=3) 0 =&gt; string 'dwd' (length=3) 1 =&gt; string 'cns' (length=3) 2 =&gt; string 'java' (length=4)

    Associative Arrays

    • Associative arrays may contain either digits or strings as keys.
    • If a key is not specified, it is considered as an integer by default in incremental order.
    • Example: array (size=3) 'dwd' =&gt; int 65 'cns' =&gt; int 60 'java' =&gt; int 55
    • Index is automatically started from the one digit more than the previous integer index.

    Multidimensional Arrays

    • Multidimensional arrays contain another array inside an array.
    • Example: output: Marks for Sachin in dwd: 55 Marks for Kartik in cns: 62 Marks for Nupur in java: 39

    Adding Elements to Array

    • Once an array is declared, it is possible to insert elements into it using the array_push() function.

    PHP Arrays

    • An array is a data structure that stores one or more similar type of values in a single variable.
    • An array stores multiple values in one single variable.
    • An array is a special variable that can hold more than one value at a time.
    • Defining an array: $array_name = array(key1=&gt;value1, key2=&gt;value2, key3=&gt;value3… );
    • Types of arrays: numeric, associative, and multidimensional arrays.

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    Description

    Learn the difference between numeric arrays and associative arrays in web technology. Explore how numeric arrays use numbers as indices, while associative arrays can use either digits or strings as keys.

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