{"id":145,"date":"2011-12-24T15:08:31","date_gmt":"2011-12-24T15:08:31","guid":{"rendered":"https:\/\/ibex.tech\/cloud\/?p=145"},"modified":"2022-02-17T07:14:05","modified_gmt":"2022-02-17T07:14:05","slug":"variables","status":"publish","type":"post","link":"https:\/\/ibex.tech\/cloud\/php\/memory\/variables","title":{"rendered":"Variables"},"content":{"rendered":"\n

Variables General<\/h4>\n\n\n\n

Variable names must start with a ‘$’ character (to allow the php parser to work as fast as possible by instantly know it is a variable).<\/p>\n\n\n\n

A variable name must start with a letter of the alphabet or and underscore ‘_’.<\/p>\n\n\n\n

Variable names may only contain: ‘a’ – ‘z’, ‘A’ – ‘Z’ and ‘_’<\/p>\n\n\n\n

Variable names are case sensitive.<\/p>\n\n\n\n

Variable Types<\/h4>\n\n\n\n

PHP will always convert a variable to the type requried by the contect it is being used in.<\/p>\n\n\n\n

$number = 12345 & 67890;\u00a0\u00a0 \/\/$number is used as a numeric varaible\necho substr ($number, 3, 1);   \/\/$number is used as a string<\/code><\/pre>\n\n\n\n
Static Variables<\/h4>\n\n\n\n
Use in functions to retain a value between calls.<\/p>\n\n\n\n
static $LastPostTitle = \"\";<\/code><\/pre>\n\n\n\n
Note that whilst you can assign an initial value, it must not be the result of an expression (e.g. “= 2 + 4” is not allowed)<\/p>\n\n\n\n
Global Variables<\/h4>\n\n\n\n
global $ProductCodeName;<\/code><\/pre>\n\n\n\n
Every line of code in your program can access a global variable.<\/p>\n\n\n\n
Note that you can’t use = when declaring a global variable.\u00a0 Assign the value seperately.<\/p>\n\n\n\n
Integers<\/h4>\n\n\n\n
Integer size is platform-dependent, safest is to assume a maximum value of about two billion (32 bits signed).<\/p>\n\n\n\n
64-bit platforms usually have a maximum value of about 9E18<\/p>\n\n\n\n
Unsigned integers are not supported in PHP<\/p>\n\n\n\n
If PHP encounters a number, or the result of an operation, that is beyond the bounds of the integer type, it will be interpreted as a float instead.<\/p>\n","protected":false},"excerpt":{"rendered":"
Variables General Variable names must start with a ‘$’ character (to allow the php parser to work as fast as possible by instantly know it is a variable). A variable name must start with a letter of the alphabet or and underscore ‘_’. Variable names may only contain: ‘a’ – ‘z’, ‘A’ – ‘Z’ and […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-145","post","type-post","status-publish","format-standard","hentry","category-memory"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/posts\/145","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/comments?post=145"}],"version-history":[{"count":9,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/posts\/145\/revisions"}],"predecessor-version":[{"id":2695,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/posts\/145\/revisions\/2695"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/media?parent=145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/categories?post=145"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/cloud\/wp-json\/wp\/v2\/tags?post=145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}