Top PHP Interview Questions and Answers

1.What area unit the kinds of Array in PHP?


three kinds of Arrays in PHP:


Indexed Array – AN array with a numeric index is thought because the indexed array. Values area unit keep and accessed in linear fashion.

Associative Array – AN array with strings as index is thought because the associative array. This stores part values during association with key values instead of in a strict linear index order.

Multidimensional Array – AN array containing one or a lot of arrays is thought as dimensional array. The values area unit accessed victimisation multiple indices.

2.What is the distinction between single quoted string and double quoted string?

Singly quoted strings area unit treated virtually virtually, whereas doubly quoted strings replace variables with their values furthermore as specially decoding sure character sequences. 

For example –


<?php

$variable = "name";

$statement = 'My $variable won't print!n';

print($statement);

print "

;"

$statement = "My $variable can print!n"

print($statement);

?>


3.How to concatenate 2 strings in PHP?


To concatenate 2 string variables along, we have a tendency to use the dot (.) operator.


<?php

$string1="Hello edureka";

$string2="123";

echo $string1 . " " . $string2;

?>


4.How is it attainable to line AN infinite execution time for PHP script?


The set_time_limit(0) additional at the start of a script sets to infinite the time of execution to not have the PHP error ‘maximum execution time exceeded.’ it's conjointly attainable to specify this within the php.ini file.

5. what's the distinction between “echo” and “print” in PHP?

PHP echo output one or a lot of string. it's a language construct not a perform. therefore use of parentheses isn't needed. however if you wish to pass over one parameter to echo, use of parentheses is needed. Whereas, PHP print output a string. it's a language construct not a perform. therefore use of parentheses isn't needed with the argument list. not like echo, it continually returns one.

Echo will output one or a lot of string however print will solely output one string and continually returns one.

Echo is quicker than print as a result of it doesn't come back any price.



 What is PHP?


PHP could be a open supply, taken and object-oriented scripting language i.e. dead at server facet. it's accustomed develop internet applications (an application i.e. dead at server facet and generates dynamic page).

PHP may be a server aspect scripting language.
PHP is associate taken language, i.e. there's no would like for compilation.
PHP is associate object-oriented language.
PHP is associate ASCII text file scripting language.
PHP is straightforward and straightforward to find out language.

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