115 lines
2.9 KiB
Plaintext
115 lines
2.9 KiB
Plaintext
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===============================================================================
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A PHP CHEAT-SHEET
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===============================================================================
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----------------------------------------
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SYNTAX
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----------------------------------------
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All PHP code must be between "<?php" and "?>":
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<?php
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echo "Like this.";
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?>
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Every statement ends with a semicolon, all function arguments
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are seperated by commas, etc.
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----------------------------------------
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OPERATORS
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Normal stuff (like +, -, etc.), but *also*:
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. concatenation (mainly for strings, like "a" . "b" ... "ab")
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++ increment (add one, I.E. 1++ ... 2)
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-- decrement (subtract one, I.E. 2-- ... 1)
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----------------------------------------
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COMPARISON OPERATORS
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----------------------------------------
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== equal (same data)
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=== identical (same type + data)
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!= not-equal (different data)
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!== not-identicial (different type or data)
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< less-than
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> greater-than
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<= less-than or equal-to
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>= greater-than or equal-to
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?? null coalescing (choose first variable that's non-null,
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from left to right)
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----------------------------------------
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VARIABLES
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----------------------------------------
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All variables start like "$". Assignment is like this:
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$variable = "value";
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----------------------------------------
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FUNCTIONS
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Make a function like a lot of languages:
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function FUNCTION_NAME($ARGUMENT, $ARGUMENT) {
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BLAH BLAH BLAH;
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return BLAH;
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}
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... replace FUNCTION_NAME with the name, $ARGUMENT with a variable name,
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etc. etc.
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If you want an argument to be optional, assign it a default value, like:
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function FUNCTION_NAME($ARGUMENT = "default", $ARGUMENT = 2) {
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----------------------------------------
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ARRAYS
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----------------------------------------
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Make an array with
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array(KEY=>VALUE, KEY=>VALUE);
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VARIABLE can be a string or a number.
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Get an array value like
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$array[KEY]
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----------------------------------------
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GLOBAL VARIABLES
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----------------------------------------
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There are some important global variables--
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$GET Hosts all GET data.
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$POST All POST data
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$SERVER SERVER data
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$GLOBALS Contains all global vars.
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They're all arrays.
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Variables are local to their function-- and often, global variables from
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certain functions won't be accessible in the global scope of another.
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To reliably access (inter-file) globals, access them like values in an
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array of $GLOBALS
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$GLOBALS[KEY]
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----------------------------------------
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ETC.
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----------------------------------------
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Really, most of PHP is really similar to other languages.
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You should be able to read it pretty easily-- if there's something
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you don't quite get, you can use the Wikibook
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https://en.wikibooks.org/wiki/PHP_Programming/
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For quick reference. And for function definitions/examples, check the
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PHP documentation
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https://secure.php.net/docs.php
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Also Google loves you <3
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