Interface with Operating System
This chapter provides tutorial notes and example codes on PHP interface with the operating system. Topics include $argv for command line arguments; `command`, shell_exec(), exec(), and system() for external program executions; popen() and proc_open() to map external program input/output as file handles.
$argv - Command Line Arguments
Options to Execute External Programs
`command` - Backtick Operator
exec() - Execute External Programs
system() - Execute External Programs
passthru() - Execute External Programs
popen() - Execute External Programs
proc_open() - Execute External Programs
memory_get_usage() - Memory Usage Info
- Built-in array $argv can be used to retrieve command line arguments
when PHP script files are executed with the 'php' command.
- Backtick operator, `command`, runs a command and returns its output.
- shell_exec("command") does the same job as `command`.
- exec("command", $output, $rc) function runs a command and returns its output in $output.
- passthru("command", $rc) function runs a command and shares its stdout
with the calling script.
- system("command", $rc) function runs a command and shares its stdout
with the calling script. But the its stdout is flushed at each output line.
- $fh = popen("command", "w/r") function runs a command and maps its stdin or stdout
to the returning file handle.
- $ph = proc_open("command", $io_spec, $pipes) function runs a command and maps its
stdin, stdout and stderr to file handles according the given specs.
Table of Contents
About This Book
Introduction and Installation of PHP 7.3
PHP Script File Syntax
PHP Data Types and Data Literals
Variables, References, and Constants
Expressions, Operations and Type Conversions
Conditional Statements - "if" and "switch"
Loop Statements - "while", "for", and "do ... while"
Function Declaration, Arguments, and Return Values
Arrays - Ordered Maps
►Interface with Operating System
Introduction of Class and Object
Integrating PHP with Apache Web Server
Retrieving Information from HTTP Requests
Creating and Managing Sessions in PHP Scripts
Sending and Receiving Cookies in PHP Scripts
Controlling HTTP Response Header Lines in PHP Scripts
Managing File Upload
MySQL Server Connection and Access Functions
Functions to Manage Directories, Files and Images
SOAP Extension Function and Calling Web Services
SOAP Server Functions and Examples
Localization Overview of Web Applications
Using Non-ASCII Characters in HTML Documents
Using Non-ASCII Characters as PHP Script String Literals
Receiving Non-ASCII Characters from Input Forms
"mbstring" Extension and Non-ASCII Encoding Management
Managing Non-ASCII Character Strings with MySQL Servers
Parsing and Managing HTML Documents
Configuring and Sending out Emails
Image and Picture Processing
Managing ZIP Archive Files
Managing PHP Engine and Modules on macOS
Managing PHP Engine and Modules on CentOS
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