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Intro

This tutorial helps to build your own version of the official php docker image with enabled debug options. Additionaly, this tutorial covers the steps to manualy patch php sources and manually rebuild it inside the container based on php official docker image.

Building php docker image with debug enabled

Starting from Dec 2023, building tools used to build official php docker image received support of DOCKER_PHP_ENABLE_DEBUG field. So, now it's pretty easy to build needed php version with --enable-debug flag.

Steps:

1. Clone docker-library/php repository to docker-library-php folder

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const url = process.argv[2];
const concurrency = process.argv[3] === undefined ? 1 : parseInt(process.argv[3]);
const requestInterval = process.argv[4] === undefined ? 10000 : parseInt(process.argv[4]);

if (url === undefined || isNaN(concurrency) || isNaN(requestInterval)) {
    console.log('Usage: node no_keepalive_test.js http://google.com/ 10 10000');
    console.log('Where: 2nd - URL');
    console.log('       3rd - amount of concurrent connections (default is 1)');
    console.log('       4rd - interval between sequential requests');
    process.exit();

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const url = process.argv[2];
const concurrency = process.argv[3] === undefined ? 1 : parseInt(process.argv[3]);
const requestInterval = process.argv[4] === undefined ? 10000 : parseInt(process.argv[4]);

if (url === undefined || isNaN(concurrency) || isNaN(requestInterval)) {
    console.log('Usage: node keepalive_test.js http://google.com/ 10 10000');
    console.log('Where: 2nd - URL');
    console.log('       3rd - amount of concurrent connections (default is 1)');
    console.log('       4rd - interval between sequential requests');
    process.exit();

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const {EventEmitter} = require('events');

const ee = new EventEmitter();

function log(...args) {
    console.log(Date.now() / 1000, ...args);
}

function blockingOperation() {
    log('-- Blocking operation has started');

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setTimeout(() => { process.exit(); }, 200);

function f() {
    try {
        return new Promise((resolve, reject) => {
            throw new Error('Error: Threw right in the executor');
        });
    } catch (err) {
        console.log('Error caught in f()', err);
    }

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const cluster = require('cluster');

async function waitForMessage(child) {
  return new Promise(resolve => {
    child.once('message', msg => {
      console.log('Master. waitForMessage. Message is received', msg);
      return resolve();
    });
  });
}

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const {EventEmitter} = require('events');

const ee = new EventEmitter();

function waitForMessage() {
  return new Promise(resolve => {
    ee.once('message', msg => {
      console.log('waitForMessage. Message is received', msg);
      resolve();
      console.log('waitForMessage. Ooops, resolve will run in microtask. not immediately');

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#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    struct addrinfo hints, *res, *p;

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#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    struct addrinfo hints, *res, *p;

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#include <arpa/inet.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <stdio.h>

int main(int argc, char* argv[], char* envp[]) {
    struct ifaddrs *ifa=NULL,*ifEntry=NULL;
    void *addPtr = NULL;
    int rc = 0;