PHP ARRAY FUNCTIONS

How do you define an associative array in PHP?

a) By using numeric keys
b) By using the array() function
c) By using the => symbol to associate names with values
d) By using the list() function

How do you define an associative array in PHP?

a) By using numeric keys
b) By using the array() function
c) By using the => symbol to associate names with values
d) By using the list() function

How do you access the number of elements in an array in PHP?

a) Using the size() function
b) Using the length() function
c) Using the count() function
d) Using the elements() function

How do you access the number of elements in an array in PHP?

a) Using the size() function
b) Using the length() function
c) Using the count() function
d) Using the elements() function

What is an associative array in PHP?

a) An array with only numeric keys
b) An array with both numeric and named keys
c) An array with named keys
d) An array with no keys

What is an associative array in PHP?

a) An array with only numeric keys
b) An array with both numeric and named keys
c) An array with named keys
d) An array with no keys

How do you define an associative array in PHP?

a) By using numeric keys
b) By using the array() function
c) By using the => symbol to associate names with values
d) By using the list() function

How do you define an associative array in PHP?

a) By using numeric keys
b) By using the array() function
c) By using the => symbol to associate names with values
d) By using the list() function

What is a multidimensional array in PHP?

a) An array that contains only one element
b) An array with a single dimension
c) An array in which each element can be an array
d) An array with no elements

What is a multidimensional array in PHP?

a) An array that contains only one element
b) An array with a single dimension
c) An array in which each element can be an array
d) An array with no elements

What is the purpose of the print_r() function in PHP?

a) To print the values of an array
b) To print a random number
c) To print the length of an array
d) To print the keys of an array

What is the purpose of the print_r() function in PHP?

a) To print the values of an array
b) To print a random number
c) To print the length of an array
d) To print the keys of an array

array_combine()

The array_combine() function creates an array by using the elements from one “keys” array and one “values” array.

array_combine(keys, values)

<?php

$name=array(“Manoj”,”Rahul”,”Aneesh”);

$marks=array(“75″,”89″,”44”);

$c=array_combine($name,$marks); print_r($c);

OUTPUT:

Array ( [Manoj] => 75 [Rahul] => 89 [Aneesh] => 44 )

array_chunk()

- The array_chunk() function splits an array into chunks of new arrays.

- array_chunk(array, size, preserve_key)

<?php

$courses=array(“PHP”,”Laravel”,”Node

js”,”HTML”,”CSS”,”ASP.NET”);

print_r(array_chunk($courses,2));

OUTPUT:

Array ( [0] => Array ( [0] => PHP [1] => Laravel ) [1] => Array ( [0]

=> Node js [1] => HTML ) [2] => Array ( [0] => CSS [1] => ASP.NET ) )

array_chunk()

<?php

$courses=array(“a”=>”PHP”,”b”=>”Laravel”,”c”=>”Node js”,”d”=>”HTML”,”e”=>”CSS”,”f”=>”ASP.NET”);

print_r(array_chunk($courses,2));

OUTPUT:

Array ( [0] => Array ( [0] => PHP [1] => Laravel ) [1] => Array ( [0] => Node js [1] => HTML ) [2] => Array ( [0] => CSS [1] => ASP.NET ) )

array_chunk()

<?php

$courses=array(“a”=>”PHP”,”b”=>”Laravel”,”c”=>”Node js”,”d”=>”HTML”,”e”=>”CSS”,”f”=>”ASP.NET”);

print_r(array_chunk($courses,2, true));

OUTPUT:

Array ( [0] => Array ( [a] => PHP [b] => Laravel ) [1] => Array ( [c] => Node js [d] => HTML ) [2] => Array ( [e] => CSS [f] => ASP.NET ) )

array_count_values()

The array_count_values() function counts no. of times each unique value of an array.
array_count_values(array)

<?php

$a=array(“Block 33″,”Block 34″,”Block 34″,”Block 36″,”Block 36”);

print_r(array_count_values($a));

OUTPUT:

Array ( [Block 33] => 1 [Block 34] => 2 [Block 36] => 2 )

array_diff()

The array_diff() function compares the values of two (or more) arrays, and returns the differences.
This function compares the values of two (or more) arrays, and return an array that contains the entries from array1 that are not present in array2 or array3, etc.
array_diff(array1, array2, array3, …)

array_diff()

<?php

$a1=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”,”d”=>”yello w”);

$a2=array(“e”=>”red”,”f”=>”green”,”g”=>”blue”);

$result=array_diff($a1,$a2);

print_r($result);

OUTPUT:

Array ( [d] => yellow )

array_flip()

The array_flip() function flips/exchanges all keys with their associated values in an array.
array_flip(array)

<?php

$a1=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”,”d”=>”yello w”);

$result=array_flip($a1); print_r($result);

OUTPUT:

Array ( [red] => a [green] => b [blue] => c [yellow] => d )

array_flip()

<?php

$a1=array(“red”,”green”,”blue”,”yellow”);

$result=array_flip($a1); print_r($result);

OUTPUT:

Array ( [red] => 0 [green] => 1 [blue] => 2 [yellow] => 3 )

array_intersect()

The array_intersect() function compares the values of two (or more) arrays, and returns the matches.

array_intersect(array1, array2, array3, …)

<?php

$a1=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”,”d”=>”yellow”);

$a2=array(“e”=>”red”,”f”=>”green”,”g”=>”blue”);

$a3=array(“red”,”blue”);

$result=array_intersect($a1,$a2,$a3); print_r($result);

OUTPUT:

Array ( [a] => red [c] => blue )

array_merge()

Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.
array_merge(array1, array2, array3, …)

<?php

$a1=array(“a”=>”red”,”b”=>”green”);

$a2=array(“c”=>”blue”,”b”=>”yellow”);

$a3=array(“c”=>”orange”,”b”=>”magenta”); print_r(array_merge($a1,$a2,$a3));

?> OUTPUT:

Array ( [a] => red [b] => magenta [c] => orange )

array_merge()

<?php

$a1=array(“red”,”green”, “blue”);

$a2=array(“blue”,”yellow”); print_r(array_merge($a1,$a2));

OUTPUT:

Array ( [0] => red [1] => green [2] => blue [3] => blue [4] => yellow )

array_pop()

The array_pop() function deletes the last element of an array.
array_pop(array)

<?php

$a=array(“red”,”green”,”blue”); array_pop($a);

print_r($a);

OUTPUT:

Array ( [0] => red [1] => green )

array_pop()

<?php

$a=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”); array_pop($a);

print_r($a);

OUTPUT:

Array ( [a] => red [b] => green )

array_push()

The array_push() function inserts one or more elements to the end of an array.
array_push(array, value1, value2, …)

<?php

$a=array(“red”,”green”); array_push($a,”blue”,”yellow”); print_r($a);

OUTPUT:

Array ( [0] => red [1] => green [2] => blue [3] => green )

array_push()

<?php

$a=array(“a”=>”red”,”b”=>”green”); array_push($a,”blue”,”yellow”); print_r($a);

OUTPUT:

Array ( [a] => red [b] => green [0] => blue [1] => yellow )

array_reverse()

The array_reverse() function returns an array in the reverse order.
array_reverse(array, preserve)

<?php

$a=array(“a”=>”Volvo”,”b”=>”BMW”,”c”=>”Toyota”); print_r(array_reverse($a));

OUTPUT:

Array ( [c] => Toyota [b] => BMW [a] => Volvo )

array_reverse()

Pass true value to preserve the key

<?php

$a=array(“Volvo”,”BMW”,”Toyota”); print_r(array_reverse($a, true));

OUTPUT:

Array ( [2] => Toyota [1] => BMW [0] => Volvo )

array_search()

The array_search() function search an array for a value and returns the key.
array_search(value, array, strict)

<?php

$a=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”); echo array_search(“red”,$a);

OUTPUT:

array_search()

<?php

$a=array(“a”=>”1″,”b”=>1,”c”=>”1”);

echo array_search(1,$a,true);

OUTPUT:

array_slice()

The array_slice() function returns selected parts of an array.
array_slice(array, start, length, preserve)

<?php

$a=array(“a”=>”red”,”b”=>”green”,”c”=>”blue”,”d”=>”yellow”,”e”=>”brow n”);

print_r(array_slice($a,1,2));

echo “<br>”;

$a=array(“red”,”green”,”blue”,”yellow”,”brown”);

print_r(array_slice($a,1,2,true));

?> OUTPUT:

Array ( [b] => green [c] => blue ) Array ( [1] => green [2] => blue )

array_column()

The array_column() function returns the values from a single column in the input array.

array_column(array, column_key, index_key)

<?php

$result = array( array(‘name’=>’Manoj’,’cgpa’=>6.7,’status’=>’pass’), array(‘name’=>”Shalini”,’cgpa’=>9.8,’status’=>’pass’), array(‘name’=>’Mani’,’cgpa’=>3.2,’status’=>’fail’)

);

$name = array_column($result, ‘name’);

print_r($name);

?> OUTPUT:

Array ( [0] => Manoj [1] => Shalini [2] => Mani )

array_column()

<?php

);

$names = array_column($result, ‘status’, ‘name’); print_r($names);

What does the array_combine() function do?

A. Merges two arrays into one array
B. Combines elements from two arrays into a new array using one as keys and the other as values
C. Compares two arrays and returns the differences
D. Reverses the order of elements in an array

What does the array_combine() function do?

A. Merges two arrays into one array
B. Combines elements from two arrays into a new array using one as keys and the other as values
C. Compares two arrays and returns the differences
D. Reverses the order of elements in an array

What is the purpose of the array_chunk() function in PHP?

A. Counts the occurrences of unique values in an array
B. Splits an array into chunks of smaller arrays
C. Merges two arrays into one array
D. Removes the last element from an array

What does the array_count_values() function do?

A. Compares the values of two arrays and returns the differences
B. Flips/exchanges all keys with their associated values in an array
C. Counts the number of times each unique value appears in an array
D. Inserts one or more elements to the end of an array

What does the array_count_values() function do?

A. Compares the values of two arrays and returns the differences
B. Flips/exchanges all keys with their associated values in an array
C. Counts the number of times each unique value appears in an array
D. Inserts one or more elements to the end of an array

[pdf_note link=”https://drive.google.com/file/d/134rN0I5YP1BZG4_Xg9_uM7pyTPq8yx7X/view”]

INT220 – Array Functions – B.TECH (CSE) LPU Notes

Editorial Staff

PHP ARRAY FUNCTIONS

How do you define an associative array in PHP?

How do you define an associative array in PHP?

How do you access the number of elements in an array in PHP?

How do you access the number of elements in an array in PHP?

What is an associative array in PHP?

What is an associative array in PHP?

How do you define an associative array in PHP?

How do you define an associative array in PHP?

What is a multidimensional array in PHP?

What is a multidimensional array in PHP?

What is the purpose of the print_r() function in PHP?

What is the purpose of the print_r() function in PHP?

array_combine()

array_chunk()

array_chunk()

OUTPUT:

array_chunk()

OUTPUT:

array_count_values()

OUTPUT:

array_diff()

array_diff()

OUTPUT:

array_flip()

OUTPUT:

array_flip()

OUTPUT:

array_intersect()

array_merge()

array_merge()

OUTPUT:

array_pop()

OUTPUT:

array_pop()

OUTPUT:

array_push()

OUTPUT:

array_push()

OUTPUT:

array_reverse()

OUTPUT:

array_reverse()

OUTPUT:

array_search()

OUTPUT:

array_search()

OUTPUT:

array_slice()

array_column()

array_column()

What does the array_combine() function do?

What does the array_combine() function do?

What is the purpose of the array_chunk() function in PHP?

What does the array_count_values() function do?

What does the array_count_values() function do?