PHP interview answers
- What does a special set of tags do in PHP?
The output is displayed directly to the browser.
- What’s the difference between include and require?
It’s how they handle failures. If the file is not found by require(), it will cause a fatal error and halt the execution of the script. If the file is not found by include(), a warning will be issued, but execution will continue.
- I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what’s the problem?
PHP Interpreter treats numbers beginning with 0 as octal. Look at the similar PHP interview questions for more numeric problems.
- Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?
In this example it wouldn’t matter, since the variable is all by itself, but if you were to print something like "{$a},000,000 mln dollars", then you definitely need to use the braces.
- How do you define a constant?
Via define() directive, like define ("MYCONSTANT", 100);
- How do you pass a variable by value?
Just like in C++, put an ampersand in front of it, like $a = &$b
- Will comparison of string "10" and integer 11 work in PHP?
Yes, internally PHP will cast everything to the integer type, so numbers 10 and 11 will be compared.
- When are you supposed to use endif to end the conditional statement?
When the original if was followed by : and then the code block without braces.
- Explain the ternary conditional operator in PHP?
Expression preceding the ? is evaluated, if it’s true, then the expression preceding the : is executed, otherwise, the expression following : is executed.
- How do I find out the number of parameters passed into function?
func_num_args() function returns the number of parameters passed in.
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Answers sourced from www.techinterviews.com
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