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What is the LD_PRELOAD trick?
...
If you set LD_PRELOAD to the path of a shared object, that file will be loaded before any other library (including the C runtime, libc.so). So to run ls with your special malloc() implementation, do this:
$ LD_PRELOAD=/path/to/my/malloc....
How to update Python?
...stalled and their versions. Some were installed by PortablePython. Use easy_install pip to install pip if it wasn't installed.
If OP has 2.7.x and wants to install a different version, e.g. <=2.6.x or >=3.x.x, then installing different versions side-by-side is fine. You must choose which vers...
Current time in microseconds in java
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On Linux, System.nanoTime() calls clock_gettime(CLOCK_MONOTONIC,_). Brian Oxley dug into Java's source code to find this nugget.
– David Weber
Aug 12 '14 at 13:18
...
Make a link use POST instead of GET
...outline: none;
}
.link-button:active {
color:red;
}
<a href="some_page">This is a regular link</a>
<form method="post" action="some_page" class="inline">
<input type="hidden" name="extra_submit_param" value="extra_submit_value">
<button type="submit" name="...
PHP foreach change original array values
...elds as $key => $field) {
if ($field['required'] && strlen($_POST[$field['name']]) <= 0) {
$fields[$key]['value'] = "Some error";
}
}
So basically use $field when you need the values, and $fields[$key] when you need to change the data.
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Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...URLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (data) {
UIImage *image = [UIImage imageWithData:data];
if (image) {
dispatch_async(dispatch_...
Should IBOutlets be strong or weak under ARC?
...efault and that the developer docs are being updated.
https://twitter.com/_danielhall/status/620716996326350848
https://twitter.com/_danielhall/status/620717252216623104
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jQuery date formatting
...stion. It works well for me in a slightly different syntax/context:
var dt_to = $.datepicker.formatDate('yy-mm-dd', new Date());
If you decide to utilize datepicker from JQuery UI, make sure you use proper references in your document's < head > section:
<link rel="stylesheet" href="http...
Get the Query Executed in Laravel 3/4
...:getQueryLog() to get all ran queries.
$queries = DB::getQueryLog();
$last_query = end($queries);
Or you can download a profiler package. I'd recommend barryvdh/laravel-debugbar, which is pretty neat. You can read for instructions on how to install in their repository.
Note for Laravel 5 users: ...
Getting the error “Missing $ inserted” in LaTeX
... mode (which is delimited by $ characters). Try escaping them; e.g. update\_element instead of update_element.
However, if you're trying to display code, a better solution would be to use the \verb command, which will typeset the text in a monospaced font and will automatically handle underscores a...