A.2. PHP File Formatting
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## A.2. PHP File Formatting

### A.2.1. General

For files that contain only PHP code, the closing tag ("?>") is never permitted. It is not required by PHP. Not including it prevents trailing whitespace from being accidentally injected into the output.

IMPORTANT: Inclusion of arbitrary binary data as permitted by `__HALT_COMPILER()` is prohibited from any Zend framework PHP file or files derived from them. Use of this feature is only permitted for special installation scripts.

### A.2.2. Indentation

Use an indent of 4 spaces, with no tabs.

### A.2.3. Maximum Line Length

The target line length is 80 characters, i.e. developers should aim keep code as close to the 80-column boundary as is practical. However, longer lines are acceptable. The maximum length of any line of PHP code is 120 characters.

### A.2.4. Line Termination

Line termination is the standard way for Unix text files. Lines must end only with a linefeed (LF). Linefeeds are represented as ordinal 10, or hexadecimal 0x0A.

Do not use carriage returns (CR) like Macintosh computers (0x0D).

Do not use the carriage return/linefeed combination (CRLF) as Windows computers (0x0D, 0x0A).

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ملحق A. Zend Framework PHP Coding Standard | البداية | A.3. Naming Conventions