Categoría: Tecnología al Día

Floating point numbers (also known as «floats», «doubles», or «real numbers») can be specified using any of the following syntaxes: <?php $a = 1.234; $b = 1.2e3; $c = 7E-10; ?> Formally: LNUM [0-9]+ DNUM ([0-9]*[\.]{LNUM}) | ({LNUM}[\.][0-9]*) EXPONENT_DNUM [+-]?(({LNUM} | {DNUM}) [eE][+-]? {LNUM}) The size of a float is platform-dependent, although a maximum of

An integer is a number of the set ? = {…, -2, -1, 0, 1, 2, …}. Syntax Integers can be specified in decimal (base 10), hexadecimal (base 16), or octal (base 8) notation, optionally preceded by a sign (- or +). To use octal notation, precede the number with a 0 (zero). To use

Four scalar types: boolean integer float (floating-point number, aka double) string Two compound types: array object And finally two special types: resource NULL This manual also introduces some pseudo-types for readability reasons: mixed number callback And the pseudo-variable $…. Some references to the type «double» may remain in the manual. Consider double the same as

This is the simplest type. A boolean expresses a truth value. It can be either TRUE or FALSE. Note: The boolean type was introduced in PHP 4. Syntax To specify a boolean literal, use the keywords TRUE or FALSE. Both are case-insensitive. <?php $foo = True; // assign the value TRUE to $foo ?> Typically,

PHP supports ‘C’, ‘C++’ and Unix shell-style (Perl style) comments. For example: <?php echo ‘This is a test’; // This is a one-line c++ style comment /* This is a multi line comment yet another line of comment */ echo ‘This is yet another test’; echo ‘One Final Test’; # This is a one-line shell-style

When PHP parses a file, it looks for opening and closing tags, which tell PHP to start and stop interpreting the code between them. Parsing in this manner allows PHP to be embedded in all sorts of different documents, as everything outside of a pair of opening and closing tags is ignored by the PHP