Tradehull Interview Questions and Answers

There are three main types of errors in PHP: syntax errors, runtime errors, and logical errors.

• Syntax errors occur when there is a mistake in the code that prevents it from being parsed correctly by the PHP engine. For example, missing semicolons or parentheses.

• Runtime errors occur during the execution of the code, such as division by zero or calling a function that does not exist.

• Logical errors occur when the code runs without any syntax or runtime errors, but does not produ...read more

include() includes and evaluates a specified file, while include_once() does the same but ensures the file is only included once.

• include() can include the same file multiple times, while include_once() will only include it once

• include() will continue to execute the script even if the file is not found, while include_once() will throw a warning and continue

• include_once() is useful for preventing multiple declarations of functions or classes

Array functions in PHP are used to manipulate arrays in various ways.

• array_push() - adds one or more elements to the end of an array

• array_pop() - removes and returns the last element of an array

• array_merge() - merges one or more arrays into a single array

• array_slice() - extracts a slice of an array

• array_search() - searches an array for a specific value and returns the corresponding key if successful

GET is used to request data from a specified resource, while POST is used to submit data to be processed to a specified resource.

• GET requests data from a specified resource, and should only be used for retrieving data.

• POST submits data to be processed to a specified resource, and can be used for creating or updating data.

• GET requests can be bookmarked and cached, while POST requests cannot.

• GET requests have length restrictions, while POST requests do not.

• GET requests are visi...read more

Unlink is used to delete a file from the filesystem, while unset is used to unset a variable.

• Unlink is used to delete a file from the filesystem in PHP.

• Unset is used to unset a variable in PHP.

• Unlink requires the file path as an argument, while unset requires the variable name.