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The unset () function of PHP is used to clear and destroy variables. unused variables can be destroyed using unset. However, in some cases, the memory occupied by destroying variables cannot be reached with unset! Let's first look at an example:

This is explained in the PHP Manual: file_get_contents-reads the entire file into a string, so it is easy to get information from other sites, use regular expressions to transform, and then make some judgments and settings, it's okay. I don't want

For phpfile_get_contents data collection and common problems, see solution. In php, the file_get_contents function is rarely used for batch data collection. However, for a small amount of data, you can use the file_get_contents function, because it

The PHP unset () function is used to clear, destroy variables, and we can destroy them with unset (). But at some point, using unset () does not achieve the memory that is consumed by destroying variables! Let's look at an example first:

Some pages must be logged in to see, this time to crawl the information must be in the header to pass the cookie value to get 1, first login to the website, open Firebug can see the corresponding cookie copy these cookies can be used 2.

Let's look at the problem first.File_get_contents cannot obtain the URL with PortFor example: The code is as follows:Copy code File_get_contents ('http: // localhost: 100 '); There is no get.Solution: disable selinux.1 Permanent method-server

Let's first look at an example: The code is as follows:Copy code $ S = str_repeat ('1', 255); // generates a string consisting of 255 1$ M = memory_get_usage (); // Get the memory occupied currentlyUnset ($ s );$ Mm = memory_get_usage (); //

$t = ' Chrome Test '; $pre _reg = '/.*? Preg_match_all ($pre _reg, $t, $matches); Print_r ($matches); $t I omitted the other, leaving only the main information, but even so still cannot output, what is this problem (My intention is to

Untitled Document A = $_a;} function UpdateA ($_a = "Tom") {$this->a->name = $_a;} function Geta () {return $this->a;}} $p = new Person (), $a 1 = new A (); Echo ($a 1->name. "$p->seta ($a 1);//Call the SetA method and pass the object into Echo ($

With PHP and MySQL to do something, with a Select the image uploaded to the database URL is the absolute path, the query out after the display, how to make a relative path (such as: Http://192.168.40.10:1500/php/www/pictures/1.jpeg), trouble

PHP memory overflow Allowedmemorysizeof solution Allowedmemorysizeof? Xxxbytes? I have tracked this problem before, but at that time the tool was not used very well. I didn't see it so carefully. this time I made a little detail and corrected my

This post was last edited by xuzuning on 2011-06-10 14:40:16 Given the items n pieces, their weight is w[0],w[1],......w[n-1], the value of the goods is v[0],v[1],......v[n-1], and another backpack, it can hold the total weight of W. Design an item

Application of four methods of _set () __get () __isset () __unset ()In general, it is more realistic logic to always define the properties of a class as private. However, the read and assign operations for the properties are very frequent, so in

A Memory Overflow SolutionWhen doing statistical analysis of the data, often encounter large arrays, memory overflow may occur, here to share my solution. Or an example to illustrate the problem, as follows:Assuming that the number of records stored

In php, The file_get_contents function is rarely used for batch data collection. However, for a small amount of data, you can use the file_get_contents function, because it is not only easy to use but also easy to learn, next, I will introduce the

In php, magic functions include tostring, call, clone, and autoload. I hope this tutorial will be helpful to all of you. Object-Oriented development Summary 1. Description and configuration of the object. (It can be understood as the output text

In general, it is more realistic logic to always define the properties of a class as private. However, the read and assign operations for the properties are very frequent, so in PHP5, two functions "__get ()" and "__set ()" are predefined to get and

Copy codeThe Code is as follows:For ($ I = 1; I I $ Str = str_repeat ('20140901', $ I );$ A = memory_get_usage ();Unset ($ str );$ B = memory_get_usage ();Echo "\ n". $ I. ':'. ($ B-$ a). 'bytes .';} The result shows that:8x32 = 256 it is really

PHP Learning Basics-File System (ii) file read and write operations, file resource processing I. Opening and closing of files /* * Read the contents of the file *file_get_contents (); PHP5 above *file () *readfile (); * * Insufficient: Read all,

A Memory Overflow Solution When doing statistical analysis of data, often encounter large arrays, memory overflow may occur, here to share my solution. Use examples to illustrate the problem, as follows:Assuming that the log holds 500,000 records,