Advanced php interview questions and some answers

I saw some advanced php interview questions on the internet ...... I got some answers ...... It may not be comprehensive. Leave it for future use. I. Basic knowledge point 1.1The meaning of several status codes in the HTTP protocol: 503500401403404200301302 ...... 200: the request is successful, and the requested data is returned accordingly. 301: Permanent redirection. 3

I saw some advanced php interview questions on the internet ...... I got some answers ...... It may not be comprehensive. Leave it for future use. I. Basic knowledge point 1.1 meaning of several status codes in HTTP: 503 500 401 403 404 200 301 ...... 200: the request is successful, and the requested data is returned accordingly. 301: Permanent redirection. 3

I saw some advanced php interview questions on the internet ......

I got some answers ...... It may not be comprehensive. Leave it for future use.

I. Basic knowledge point

1.1 meaning of several status codes in HTTP: 503 500 401 403 404 200 301 302 ......

200: the request is successful, and the requested data is returned accordingly.

301: Permanent redirection.

302: Temporary row redirection.

401: the current request requires user verification.

403: the server does not have the permission to execute the request.

404: The request failed. The request data is not found on the server.

500: server error. Generally, the server program execution is incorrect.

503: temporary server maintenance or overload. This status is temporary.

1.2 Include require include_once require_once.

Different Processing failure methods:

When require fails, a fatal error is generated and the program is stopped.

When the include operation fails, only one warning error is generated, and the program continues to run.

Include_once/require_once and include/require handle errors in the same way,

The only difference is that when the included file code already exists, it is not included.

History of several versions in 1.3 PHP/Mysql, such as major improvements from mysql4.0 to 4.1 and from PHP 4.x to 5.1.

1.4 HEREDOC Introduction

A method for defining strings.

Structure:

<. At the end of the prompt, you must define an identifier (a single line ),

Then there is a new line. Next is the string itself,

Finally, use the identifier defined above as the end sign (a separate row)

Note:

It can only contain letters, numbers, and underscores, and must begin with a letter or underscore

1.5 write some php magic methods;

_ Construct () is automatically called when the class is instantiated.

The _ destruct () Class Object is automatically called when it is used.

_ Set () is called when an undefined attribute is assigned a value.

_ Get () is called when an undefined attribute is called.

_ Isset () is called when isset () or empty () functions are used.

_ Unset () is called when unset () is used.

_ Sleep () is called when serialize is used for serialization.

_ Wakeup () is called when unserialize is used for deserialization.

_ Call () is called when a nonexistent method is called.

_ CallStatic () calls a non-existent static method.

_ ToString () is called when the object is converted to a string. For example, echo.

_ Invoke () is called when an object is called as a method.

_ Set_state () is called when var_export () function is used. Accept an array parameter.

_ Clone () is called when clone is used to copy an object.

1.6 some configure parameters for php Compilation

? Prefix =/usr/local/php installation directory

? With-config-file-path =/usr/local/php/etc specify the php. ini location

? With-mysql =/usr/local/mysql installation directory, support for mysql

? With-mysqli =/usr/local/mysql/bin/mysql_config mysqli file directory, optimized support

? Enable-safe-mode: enable safe mode

? Enable-ftp support for enabling ftp

? Enable-zip supports zip

? With-bz2 opens support for bz2 files

? With-jpeg-dir open support for jpeg images

? With-png-dir open support for png Images

? With-freetype-dir open freetype library support

? Without-iconv disable the iconv function and convert between character sets.

? Support for opening libxml2 library with-libxml-dir

? With-xmlrpc open the C language of xml-rpc

? With-zlib-dir supports opening the zlib library

? With-gd supports opening the gd library

For more information, see./configure help.

1.7 three methods for passing parameters to php.

/*

* Method 1 use $ argc $ argv

* Run/usr/local/php/bin/php./getopt. php-f 123-g 456 in the command line.

*/

// If ($ argc> 1 ){

// Print_r ($ argv );

//}

/**

* Running result

*

Sync @ MySUSE11 :~ /Web_app/channel3/interface>/usr/local/php/bin/php./getopt. php-f 123-g 456

Array

(

[0] =>./getopt. php

[1] =>-f

[2] => 123.

[3] =>-g

[4] = & gt; 456

)

*/

/*

* Method 2 use the getopt function ()

* Run/usr/local/php/bin/php./getopt. php-f 123-g 456 in the command line.

*/

// $ Options = "f: g :";

// $ Opts = getopt ($ options );

// Print_r ($ opts );

/**

* Running result

*

Sync @ MySUSE11 :~ /Web_app/channel3/interface>/usr/local/php/bin/php./getopt. php-f 123-g 456

Array

(

[F] = & gt; 123

[G] = & gt; 456

)

*/

/*

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