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These expressions are most commonly used inside conditional execution, (equal to and same type) and != (not equal to or not same type).
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The language also supports a set of strict equivalence operators: = != (not equal), < (smaller than) and <= (smaller than or equal to). Supports > (bigger than), >= (bigger than or equal to), = (equal), These expressions evaluate to either false or true. $variable, before it was incremented (PHP increments the variableĪfter reading its value, thus the name 'post-increment').Ī very common type of expressions are comparisonĮxpressions. Written $variable++ evaluates to the original value of Incremented value (PHP increments the variable before reading its Pre-increment, which is written ++$variable, evaluates to the Theĭifference is with the value of the increment expression. Variable, and the effect on the variable is identical. In PHP, like in C, thereĪre two types of increment - pre-increment and post-increment.īoth pre-increment and post-increment essentially increment the Languages may be familiar with the notation of variable++ and Right to left order, you can also write $b = $a = 5.Īnother good example of expression orientation is pre- and In practice, it means that $a = 5, regardless of what it does, TheĪssignment itself evaluates to the assigned value, in this case 5. Here, and that's the value of the assignment itself. But the truth is that there's one additional value involved There are two values involved here, the value of the integerĬonstant 5, and the value of $a which is being updated to 5 as Consider theĮxample we've already dealt with, $a = 5. Sense that almost everything is an expression. PHP is an expression-oriented language, in the PHP takes expressions much further, in the same way many other languagesĭo. These value types can be assigned into variables or returned from functions. Supports two composite (non-scalar) types: arrays and objects. Values and bool values (scalar values are values that youĬan't 'break' into smaller pieces, unlike arrays, for instance). Values, floating point values ( float), string PHP supports four scalar value types: int Of course, values in PHP don't have to be integers, and very often Usuallyįunctions don't just return a static value but compute something. Returns 5, the value of the expression ' foo()' is 5. FunctionsĪre expressions with the value of their return value. That typing $c = foo() is essentially just like Not, take a look at the chapter about functions), you'd assume
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#Expressions archive
Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto searchĪssuming you're familiar with the concept of functions (if you're