Core PHP Programming by Leon Atkinson

By Leon Atkinson

Center Hypertext Preprocessor Programming, 3rd version is the authoritative advisor to the recent Hypertext Preprocessor five for knowledgeable builders. best Hypertext Preprocessor developer Leon Atkinson and personal home page five contributor/Zend Engine 2 co-creator Zeev Suraski hide each part of real-world personal home page five improvement, from uncomplicated syntax to complicated item - orientated development-even layout patterns!It's all the following: networking, info buildings, normal expressions, math, configuration, pix, MySQL/PostgreSQL help, XML, algorithms, debugging, optimization...and 650 downloadable code examples, with a Foreword via Hypertext Preprocessor five contributor and Zend Engine 2 co-creator Andi Gutmans!

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The result type of an arithmetic expression can be either an integer or a floating-point number. PHP determines the result type based on whether a decimal point is necessary to describe the result or not. This is unlike strict-typed languages such as C that determine the result based only on the operand types. 6 displays the arithmetic operators. 9 demonstrates their use. 6. Arithmetic Operators Operator Operation It Performs Example + Addition Explicit positive sign 12 + 43 +13 Subtraction Negation 100 - 50 -3 * Multiplication 3 * 4 / Division 5 / 2 % Modulo division 5 % 2 42 Part I: Programming with PHP Part I: Programming with PHP 43 ++ Post-increment Pre-increment $a++ ++$a -Post-decrement Pre-decrement $a---$a Modulo division returns the integer remainder of a division and is therefore defined only for integers.

At the end is either a semicolon or a block of statements inside curly braces. For clarity, you may add any number of line breaks and spaces within the statement. Any block of PHP code that does work and ends in a semicolon is a statement. 1 shows several simple statements. > The first statement is the addition of two numbers. It produces no output. The second prints a string to the browser. The third decides whether to execute a block of code based on an expression. Consider the 2 + 3 30 Part I: Programming with PHP Part I: Programming with PHP 31 expression in the first line of the script.

This conversion is rarely used. The string literal "Array". 41 42 Part I: Programming with PHP Arithmetic Operators Addition, subtraction, multiplication, and division are familiar concepts. They may be applied to any numeric value, including integers and floating-point numbers. When used with other types of values, such as a string, PHP first converts them to numeric value and then performs the operation. The result type of an arithmetic expression can be either an integer or a floating-point number.

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