spl

Uboot启动流程分析(二)

由 纵然是瞬间 提交于 2019-12-24 06:58:52
1、前言 在前面的文章Uboot启动流程分析(一)中，链接如下： https://www.cnblogs.com/Cqlismy/p/12000889.html 已经简单地分析了low_level_init函数，其调用流程如下： save_boot_params_ret | cpu_init_crit | 　　| | 　　lowlevel_init | 　　| | 　　s_init | _main 接下来，则继续往下分析_main函数。 2、_main函数 在save_boot_params_ret的最后，会运行bl _main这句代码，Uboot则将会跳转到_main函数中去运行，该函数的定义在arch/arm/lib/crt0.S文件中，_main函数的功能已经在文件中注释得很清楚了，先来看看_main函数实现的功能是什么，注释如下： /* * This file handles the target-independent stages of the U-Boot * start-up where a C runtime environment is needed. Its entry point * is _main and is branched into from the target's start.S file. * * _main execution

How to exclude file types from Directory Iterator loop

由 半腔热情 提交于 2019-12-23 19:14:17
问题 Simple directory iterator that is recursive and shows all files and directories/sub-directories. I don't see any built in function to exclude certain file types, for instance in the following example I do not want to output any image related files such as .jpg , .png , etc. I know there are several methods of doing this , looking for advice on which would be best. $scan_it = new RecursiveDirectoryIterator("/example_dir"); foreach(new RecursiveIteratorIterator($scan_it) as $file) { echo $file;

PHP: how can I sort and filter an “array”, that is an Object, implementing ArrayAccess?

由 我的梦境 提交于 2019-12-23 13:11:31
问题 I have an object that is a collection of objects, behaving like an array. It's a database result object. Something like the following: $users = User::get(); foreach ($users as $user) echo $user->name . "\n"; The $users variable is an object that implements ArrayAccess and Countable interfaces. I'd like to sort and filter this "array", but I can't use array functions on it: $users = User::get(); $users = array_filter($users, function($user) {return $user->source == "Twitter";}); => Warning:

how to work with RegexIterator::REPLACE mode?

由 若如初见. 提交于 2019-12-23 10:22:21
问题 What is wrong in my code: $i = new RegexIterator( new ArrayIterator(array( 'test1'=>'test888', 'test2'=>'what?', 'test3'=>'test999')), '/^test(.*)/', RegexIterator::REPLACE); foreach ($i as $name=>$value) echo $name . '=>' . $value . "\n"; The iterator is empty, why? Thanks for your help! 回答1: If you ommit the operation mode (3rd parameter in your new RegexIterator statement) you'll get the matching values, like so: $array = array('test1' => 'test888', 'test2' => 'what?', 'test3' => 'test999'

Does PHP 5.x have some kind of HashSet or Set Class?

由 China☆狼群 提交于 2019-12-23 06:56:33
问题 I'm used to Java where I have HashSets , ArrayLists and other Collections . But I'm workting on a PHP project right now. I need to create a set, fill that set with objects (Strings in this case), but the Set can only contain each object once. In addition I want to remove a certain object in the end from this set if it exists. This would be pretty easy with the Java collection classes. But how can I implement that in PHP? Are there any methods of array() that I am missing? I'm using PHP 5.3.

PHP LimitIterator fails (“Does not support seeking” + “Cannot rewind file”)

由 血红的双手。 提交于 2019-12-23 03:12:57
问题 I use SplFileObject and LimitIterator to read content from position x till y of a big file. This works perfectly when using a file path like /home/devel/stuff/myfile.log . When using a path like http://mydomain.com:8090/devel/stuff/myfile.log it does not work. The path is correct however. Does this fail when using absolute paths? The error messages are: PHP Warning: SplFileObject::rewind() [<a href='splfileobject.rewind'>splfileobject.rewind</a>]: stream does not support seeking in ... PHP

Why am I getting Fatal error when calling a parent's constructor?

由 不打扰是莪最后的温柔 提交于 2019-12-21 03:12:30
问题 I am extending one of the SPL (Standard PHP Library) classes and I am unable to call the parent's constructor. Here is the error I am getting: Fatal error: Cannot call constructor Here is a link to the SplQueue 's documentation: http://www.php.net/manual/en/class.splqueue.php Here is my code: $queue = new Queue(); class Queue extends SplQueue { public function __construct() { echo 'before'; parent::__construct(); echo 'I have made it after the parent constructor call'; } } exit; What could

What are the benefits of using SPL ArrayObject, ArrayIterator, RecursiveArrayIterator instead of regular arrays?

由 时间秒杀一切 提交于 2019-12-18 15:04:00
问题 I've started to learn PHP SPL from ArrayIterators and I'd like to know what are the benefits of using SPL ArrayObject, ArrayIterator, RecursiveArrayIterator instead of regular arrays? a) I've heard that loops using SPL iterators will reduce memory usage (but why?). I don't really know to believe this or no because I don't understand how can it reduce memory usage. b) Talking about RecursiveArrayIterator we can say that sometimes it could save some lines of code (we're using one foreach

Throwing Exceptions in an SPL autoloader?

由 本秂侑毒 提交于 2019-12-17 19:53:07
问题 Is there a way to throw exceptions from an SPL Autoloader in PHP in case it fails? It doesn't seem to work under PHP 5.2.11. class SPLAutoLoader{ public static function autoloadDomain($className) { if(file_exists('test/'.$className.'.class.php')){ require_once('test/'.$className.'.class.php'); return true; } throw new Exception('File not found'); } } //end class //start spl_autoload_register( array('SPLAutoLoader', 'autoloadDomain') ); try{ $domain = new foobarDomain(); }catch(Exception $c){

Difference between DirectoryIterator and FileSystemIterator

由 匆匆过客 提交于 2019-12-17 18:12:05
问题 PHP 5 introduced DirectoryIterator, and PHP 5.3 introduced FileSystemIterator. FileSystemIterator extends DirectoryIterator , but the documentation fails to say what extra features it brings. Can you tell the difference between DirectoryIterator and FileSystemIterator ? 回答1: This goes out of the top of my head, where I sort of got caught in the changes prior to PHP 5.3 that were going to change in 5.3 and later, concerning the SPL (StandardPHPLibrary) and stuff that were going to be moved to
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