PHP variable types

 The main way to store information in the middle of a PHP program is by using a variable.

Here are the most important things to know about variables in PHP.

  • All variables in PHP are denoted with a leading dollar sign ($).

  • The value of a variable is the value of its most recent assignment.

  • Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right.

  • Variables can, but do not need, to be declared before assignment.

  • Variables in PHP do not have intrinsic types - a variable does not know in advance whether it will be used to store a number or a string of characters.

  • Variables used before they are assigned have default values.

  • PHP does a good job of automatically converting types from one to another when necessary.

  • PHP variables are Perl-like.

PHP has a total of eight data types which we use to construct our variables −

  • Integers − are whole numbers, without a decimal point, like 4195.

  • Doubles − are floating-point numbers, like 3.14159 or 49.1.

  • Booleans − have only two possible values either true or false.

  • NULL − is a special type that only has one value: NULL.

  • Strings − are sequences of characters, like 'PHP supports string operations.'

  • Arrays − are named and indexed collections of other values.

  • Objects − are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.

  • Resources − are special variables that hold references to resources external to PHP (such as database connections).

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