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//Insta-perf-improvement for any #PHP codebase: 

//replace `
foreach ($b as $a) { $c = array_merge($c, $a) }
// with
array_merge($c, [], ...$b)

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<?php

$string = 'string';
$double = 12.12345;
$array = ['foo', 'bar'];
$a = 555;
$b = 'ZZZ';

var_dump(@($a + $b));
var_dump($a . $b);

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[In reply to Moroshka]
Распишу по буквам, потом в совокупности
S - (SRP):
https://www.youtube.com/watch?v=AEnePs2Evg0
https://goo.gl/LatDmF (link wikipedia)
O - (Open/closed):
https://www.youtube.com/watch?v=DJF_sGOs2V4
https://goo.gl/6p3jfY (link wikipedia)
L - (Liskov):
https://www.youtube.com/watch?v=bVwZquRH1Vk

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location ~/(admin|wp-admin|backend){
   access_log off;
   log_not_found off;
   return 404;
}

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$response = new StreamedResponse(function () {
    while (true) {
        echo 'event: message' . PHP_EOL;
        echo 'data: ' . \json_encode(['data' => 1]) . PHP_EOL;
        echo PHP_EOL . PHP_EOL;
        ob_flush();
        flush();
        sleep(2);
    };
});

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function &doSmth($arg1, $arg2){
}

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<?php
require_once __DIR__ . '/../vendor/autoload.php';
require_once __DIR__ . '/../app/autoload.php';
require_once __DIR__ . '/../app/AppKernel.php';


$kernel = new AppKernel('test', true);
$kernel->boot();
try {
    $container = $kernel->getContainer();

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source s_nginx { udp(); };

#source s_nginx { file("/var/log/nginx/my-current/access.log"); };
filter f_local7 { facility(local7); };
destination d_loghost {tcp("10.74.0.139" port(1500));};
#destination d_loghost {file("/tmp/access.log");};
log { source(s_nginx); filter(f_local7); destination(d_loghost); };

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#include <curses.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>

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#include <semaphore.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>