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from list of integers, get number closest to a given value
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If the list is already sorted, or you could pay the price of sorting the array once only, use the bisection method illustrated in @Lauritz's answer which only takes O(log n) time (note however checking if a list is already sorted is O(n) and sorting is O(n log n).)
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PHP Pass variable to next page
...rt(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.
Cookie:
//One page 1
$_COOKIE['varname'] = $var_value;
//On page 2
$var_value = $_COOKIE['varname'];
The big difference between sessions and cookies is that the v...
jQuery callback for multiple ajax calls
...ce $.when expects all of the ajax requests as sequential arguments (not an array) you'll commonly see $.when used with .apply() like so:
// Save all requests in an array of jqXHR objects
var requests = arrayOfThings.map(function(thing) {
return $.ajax({
method: 'GET',
url: 'thin...
How does free know how much to free?
...ver I pass a pointer to some function, I have to also pass the size (ie an array of 10 elements needs to receive 10 as a parameter to know the size of the array), but I do not have to pass the size to the free function. Why not, and can I use this same technique in my own functions to save me from n...
MySQL query to get column names?
I'd like to get all of a mysql table's col names into an array in php?
21 Answers
21
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Replace a character at a specific index in a string?
...rn the String into a char[], replace the letter by index, then convert the array back into a String.
String myName = "domanokz";
char[] myNameChars = myName.toCharArray();
myNameChars[4] = 'x';
myName = String.valueOf(myNameChars);
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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...；石油管道会穿越很多无人区，附近没有网络设施，因此使用卫星通讯最为经济；高轨道的GEO卫星站得高看得远，覆盖范围广，但轨道高延迟就大了。中低轨道的LEO/MEO卫星延迟小，但是覆盖区域有限，每天都会出现卫星切换时...
string sanitizer for filename
...ia.org/wiki/Filename#Reserved_characters_and_words
$name = str_replace(array_merge(
array_map('chr', range(0, 31)),
array('<', '>', ':', '"', '/', '\\', '|', '?', '*')
), '', $name);
// maximise filename length to 255 bytes http://serverfault.com/a/9548/44086
$e...
Difference between res.send and res.json in Express.js
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The methods are identical when an object or array is passed, but res.json() will also convert non-objects, such as null and undefined, which are not valid JSON.
The method also uses the json replacer and json spaces application settings, so you can format JSON with mo...
php is null or empty?
...use ==, as you did, PHP treats NULL, false, 0, the empty string, and empty arrays as equal.
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