Read e-book online PHP Pocket Reference, 2nd Edition PDF

By Rasmus Lerdorf

ISBN-10: 0596004028

ISBN-13: 9780596004026

Uncomplicated, to the purpose, and compact-in truth, precisely what you may have come to count on in an O'Reilly Pocket Reference-the moment variation of Hypertext Preprocessor Pocket Reference is punctiliously up to date to incorporate the specifics of Hypertext Preprocessor four. Written through the founding father of the Hypertext Preprocessor undertaking, Rasmus Lerdorf, Hypertext Preprocessor Pocket Reference is either a convenient creation to personal home page syntax and constitution, and a brief connection with the large array of services supplied by way of personal home page. the short reference part organizes the entire middle features of personal home page alphabetically so that you can locate what you wish simply; the slender dimension capability you could preserve it convenient beside your keyboard for these instances if you happen to are looking to search for a functionality speedy with out ultimate what you are doing. This useful little publication presents an authoritative review of Hypertext Preprocessor packed right into a pocket-sized advisor that is effortless to take anyplace. it's also definitely the right significant other for O'Reilly's finished publication on personal home page, Programming Hypertext Preprocessor. The Hypertext Preprocessor Pocket Reference an imperative (and reasonably cheap) device for any severe Hypertext Preprocessor coder.

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Extra resources for PHP Pocket Reference, 2nd Edition

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An integer can be expressed in decimal (base-10), hexadecimal (base-16), or octal (base-8). For example: $decimal=16; $hex=0x10; $octal=020; Floating Point Numbers Floating point numbers represent decimal values. The range of floating point numbers in PHP is equivalent to the range of the double type in C. 7E+308. A double may be expressed either as a regular number with a decimal point or in scientific notation. 0E-3PHP also has two sets of functions that let you manipulate numbers with arbitrary precision.

You can nest dynamic variables to an infinite level in PHP, although once you get beyond two levels, it can be very confusing for someone who is trying to read your code. There is a special syntax for using dynamic variables, and any other complex variable, inside quoted strings in PHP: echo "Hello ${$var}";This syntax also helps resolve an ambiguity that occurs when variable arrays are used. Something like $$var[1] is ambiguous because it is impossible for PHP to know which level to apply the array index to.

When $x is tripled, that change does not affect the value of $var outside the function. In contrast, when you pass an argument by reference, changes to the parameter within the function do affect the value of the argument outside the scope of the function. That's because when you pass an argument by reference, you must pass a variable to the function. Now the parameter in the function refers directly to the value of the variable, meaning that any changes within the function are also visible outside the function.

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PHP Pocket Reference, 2nd Edition by Rasmus Lerdorf


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