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Document directory
I. Introduction to types
Ii. Boolean
Iii. Integer type
Iv. String
5. Array
PHP supports eight primitive types, including:
Four scalar types: Boolean, integer, float, and string );
Two composite types: array and object
The following is about the small series for everyone to collect and organize the regular expression of PHP, the specific content please see below detailed
$str = Preg_replace ("/() (. *?) ()/", ' \1\2\3 ', $str);
It uses three sub
Opcache: Opcache originates from Zend optimizer+ renaming, the main role is to improve PHP performance by storing PHP script precompiled bytecode into shared memory, the advantage of storing precompiled bytecode is to save every time to load and
This article brings you the content is about PHP7 Source: PHP Virtual Machine Detailed analysis, there is a certain reference value, the need for a friend can refer to, I hope you have some help.
1. Speaking from the physical machine
Virtual
Collection of common php regular expressions. Php regular expressions are common pattern delimiters. Generally, they are used as delimiters to start and end. you can also use #. When to use? Generally, php regular expressions are used when your
PHP code $STR = Preg_replace ("/() (. *?) ()/", ' \1\2\3", $str); The uses three sub modes (one in each parenthesis), the first one is the link start tag, the second is the link text, and the third is then \1, \2, and \3 in the second argument,
Regular expressions for string processing, form verification, and other occasions, practical and efficient. This article collects some common expressions:
$str = Preg_replace ("/(
) (. *?) ()/", ' \1\2\3 ', $str);
It uses three sub
Php Regular Expression
General Mode
The delimiters. Generally, "/" is used as the start and end of the delimiters. You can also use "#".When can I use? Generally, when your string contains many "/" characters, this character needs to be escaped
In either language, string manipulation is an important foundation, often simple and important. As people speak, there is usually a form (graphical interface), a language (print string?). ), obviously the string can explain more things. PHP provides
Before starting, let's take a look at a simple piece of code:
Copy codeThe Code is as follows:$ Foo = 1;$ Bar = $ foo;Echo $ foo + $ bar;?>
Execute this code to print the number 2. From the memory perspective, we can analyze the Code as follows:
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