PHP variables, types, arrays, functions, superglobals, string functions, include and require, and sessions.
39 cards · basic cards · AI-written, checked twice. Edit anything.
- How do you declare a variable in PHP?
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Use a dollar sign ($) followed by the variable name, for example $name = 'John';- What are the naming rules for PHP variables?
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Must start with a dollar sign and a letter or underscore, followed by alphanumeric characters or underscores. Variable names are case-sensitive.- What is type juggling in PHP?
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Automatic conversion of a variable from one type to another when an operation requires it.- How do you explicitly cast a variable to a different type in PHP?
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Place the desired type in parentheses before the variable: (int)$var, (string)$var, (bool)$var, (array)$var.- What is the scope of a variable declared inside a function?
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Local to that function only, and cannot be accessed outside of it unless declared as global.- What does the PHP string data type store?
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Text of any length, enclosed in single or double quotes.- What is the PHP integer data type?
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A whole number with no decimal point, can be positive or negative.- What is the PHP float data type?
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A number with a decimal point or in exponential form, such as 1.5 or 2e3.- What is the PHP boolean data type?
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A data type that holds only true or false, commonly used in conditional statements.- What is the PHP array data type?
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A data structure that stores multiple values in a single variable, each accessed by an index or key.- What does the PHP NULL data type represent?
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An empty variable, assigned by setting a variable to NULL or when a variable is unset.- What is an indexed array in PHP?
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An array where elements are accessed by numeric indices starting from 0.- What is an associative array in PHP?
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An array where elements are accessed by string keys that you define instead of numeric indices.- How do you create a multidimensional array in PHP?
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Nest arrays inside other arrays, for example: $array = array(array(1, 2), array(3, 4));- What does the count() function return?
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The number of elements in an array.
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