PHP Interview Question By: Coding Tag
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What is the purpose of constant() function?
According to the name, this function return the value of the constant. but you donâ&#x20AC;&#x2122;t know its name, i.e. It is stored in a variable or returned by a function. <?php define("MINSIZE", 50); echo MINSIZE; echo constant("MINSIZE"); // same as the previous statement ?>
What is NULL?
NULL is a one special type with one and only value stored in it is : NULL.It is a special constant that is capitalized by convention, but actually it is case insensitive . $my_var = null;
Variable assigned NULL has the following properties:â&#x2013;° â&#x2013;°
It evaluates to FALSE in a Boolean context. It returns FALSE when tested with IsSet() function.
Explain the syntax for â&#x20AC;&#x2DC;foreachâ&#x20AC;&#x2122; loop.
The foreach loop statement is used to loop in arrays values ,for each value of the current array element is assigned to $value and the array pointer move one by one .So after that next element is allowed to process. foreach (array as value) { code to be executed; }
How to concatenate to strings?
To concatenate two string variables together, use the dot (.) operator. <?php $string1="Hello World"; $string2="444"; echo $string1 . " " . $string2; ?>
This will produce following result â&#x2C6;&#x2019; Hello World 444
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