What is null coalescing operator in PHP?

What is use of NULL coalesce operator?

The nullish coalescing operator ( ?? ) is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined , and otherwise returns its left-hand side operand.

When was Null coalescing operator introduced?

Null coalescing is a new operator introduced in PHP 7. This operator returns its first operand if it is set and not NULL . Otherwise it will return its second operand. $firstName = “John”; $lastName = “Doe”; echo $firstName ??

What is NULL type in PHP?

Null is a special data type in PHP which can have only one value that is NULL. A variable of data type NULL is a variable that has no value assigned to it. Any variable can be empty by setting the value NULL to the variable. Syntax: $var === null.

What does != Mean in C#?

Inequality operator !=

returns true if its operands are not equal, false otherwise. For the operands of the built-in types, the expression x != y produces the same result as the expression !(

IS null check in C#?

In C#, IsNullOrEmpty() is a string method. It is used to check whether the specified string is null or an Empty string. A string will be null if it has not been assigned a value. A string will be empty if it is assigned “” or String.

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Why was Elvis an operator?

The name “Elvis operator” refers to the fact that when its common notation, ?: , is viewed sideways, it resembles an emoticon of Elvis Presley with his quiff, or in the other direction, his smirk.

Is null in C#?

null (C# Reference)

The null keyword is a literal that represents a null reference, one that does not refer to any object. null is the default value of reference-type variables. Ordinary value types cannot be null, except for nullable value types.

Is coalesce null?

The COALESCE function evaluates its arguments from left to right. It stops evaluating until it finds the first non-NULL argument. It means that all the remaining arguments are not evaluated at all. The COALESCE function returns NULL if all arguments are NULL .


The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.


MySQL: IS NULL Condition

  • Description. The MySQL IS NULL Condition is used to test for a NULL value in a SELECT, INSERT, UPDATE, or DELETE statement.
  • Syntax. …
  • Note. …
  • Example – With SELECT Statement. …
  • Example – With INSERT Statement. …
  • Example – With UPDATE Statement. …
  • Example – With DELETE Statement.

IS NULL a string in PHP?

When it comes to database columns, PHP’s NULL has no place there. You see, SQL is a string based language. SQL’s NULL must be represented by NULL with no quotes.

What is PHP used for?

PHP is a server side scripting language that is embedded in HTML. It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites. It is integrated with a number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server.

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What is PHP call function?

A PHP function provides code that a PHP script can call to perform a task, such as Count(), file_get_contents(), and header(). The PHP language supports both procedural and object-oriented programming paradigms.

What is the use of spaceship operator?

The spaceship operator or combined comparison operator is denoted by “<=>“. This is a three-way comparison operator and it can perform greater than, less than and equal comparison between two operands. This operator has similar behavior like strcmp() or version_compare().

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