Download PDF by W Jason Gilmore: A programmer's introduction to PHP 4.0
By W Jason Gilmore
No subject what language you're acquainted with, this booklet will gain you. starting with a fast advent to PHP's syntax and simple performance, you are going to quickly comprehend Hypertext Preprocessor. The booklet then steers you towards complex matters, like PHP's position in database manipulation, classes, and person interactivity.
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Extra resources for A programmer's introduction to PHP 4.0
Single-Line Comments Two commenting styles are geared toward single-line comments. Both work exactly the same way, but they employ different escape characters. One style uses a double backslash (//) at the beginning of a comment, and the other style uses a pound symbol (#) at the beginning of a comment. Here are examples of each style: // set the color of the roses. $rose_color = "red"; # set the color of the violets. > 47 Of course, it is possible to use single-line comments to build multiline comments using either style, as seen in the following listing:
Br>"; Execution of the above listing results in: $x inside function is 0. $x outside of function is 4. As you can see, two different values for $x are output. This is because the $x located inside the assignx function is local in nature. Modification of its value has no bearing on any values located outside of the function. On the same note, modification of the $x located outside of the function has no bearing on any variables contained in assignx(). Function Parameters As is the case with many other programming languages, in PHP any function that accepts arguments must declare these arguments in the function header.
All hexadecimal integers are preceded by 0x or 0X. Some examples of hexadecimal integers are: 0x3FF 0X22abc Floating-Point Numbers A floating-point number is essentially a real numbers, that is, a number denoted either wholly or in part by a fraction. Floating-point numbers are useful for representing values that call for a more accurate representation, such as temperature or monetary figures. PHP supports two floating-point formats: standard notation and scientific notation. Standard Notation Standard notation is a convenient representation typically used for real numbers, for example, monetary values.
A programmer's introduction to PHP 4.0 by W Jason Gilmore