add postresql

array/array_flatten.php

@@ -0,0 +1,28 @@
+<?php
+
+function flatten(array $items) {
+    return array_merge(...$items);
+}
+
+$fruits = [
+    [
+        'fjjfx' => [
+            'name' => 'apple',
+            'color' => 'red',
+        ]
+    ],
+    [
+        'sizoekcv' => [
+            'name' => 'banana',
+            'color' => 'yellow',
+        ]
+    ],
+    [
+        'bshzu' => [
+            'name' => 'cherry',
+            'color' => 'red',
+        ],
+    ],
+];
+
+var_dump(flatten($fruits));

postgresql/.gitignore

@@ -0,0 +1 @@
+database_parameters.ini

postgresql/find_columns.php

@@ -0,0 +1,21 @@
+<?php
+
+require_once __DIR__.'/get_connection.php';
+
+function findColumns(PDO $connection, string $columnsHint) {
+    $hint = "%$columnsHint%";
+    $getColumnsStatement = $connection->prepare("SELECT table_name, column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE column_name LIKE :hint");
+    $getColumnsStatement->bindParam(':hint', $hint);
+    $getColumnsStatement->execute();
+    $getColumnsStatement->setFetchMode(PDO::FETCH_NUM);
+
+    foreach ($getColumnsStatement->fetchAll() as $record) {
+        $records[$record[0]][] = $record[1];
+    }
+
+    return $records;
+}
+
+$connection = getConnectionFromIniFile(__DIR__ . '/database_parameters.ini');
+
+print_r(findColumns($connection, $argv[1]));

postgresql/get_columns_by_table.php

@@ -0,0 +1,19 @@
+<?php
+
+require_once __DIR__.'/get_connection.php';
+
+function getColumnsByTable(PDO $connection) {
+    $getColumnsStatement = $connection->prepare("SELECT table_name, column_name FROM INFORMATION_SCHEMA.COLUMNS");
+    $getColumnsStatement->execute();
+    $getColumnsStatement->setFetchMode(PDO::FETCH_NUM);
+
+    foreach ($getColumnsStatement->fetchAll() as $record) {
+        $records[$record[0]][] = $record[1];
+    }
+
+    return $records;
+}
+
+$connection = getConnectionFromIniFile(__DIR__ . '/database_parameters.ini');
+
+print_r(getColumnsByTable($connection));

postgresql/get_connection.php

@@ -0,0 +1,28 @@
+<?php
+
+function getConnection($host, $port, $database, $user, $password) {
+    $connectionParameters = sprintf(
+        "pgsql:host=%s;port=%d;dbname=%s;user=%s;password=%s",
+        $host,
+        $port,
+        $database,
+        $user,
+        $password
+    );
+
+    return new PDO($connectionParameters);
+}
+
+function getConnectionFromIniFile($iniFilePath) {
+    $parameters = parse_ini_file($iniFilePath);
+    $connectionParameters = sprintf(
+        "pgsql:host=%s;port=%d;dbname=%s;user=%s;password=%s",
+        $parameters['host'],
+        $parameters['port'],
+        $parameters['database'],
+        $parameters['user'],
+        $parameters['password']
+    );
+
+    return new PDO($connectionParameters);
+}

postgresql/get_table_columns.php

@@ -0,0 +1,32 @@
+<?php
+
+require_once __DIR__.'/get_connection.php';
+
+function getTables(PDO $connection) {
+    $getTablesStatement = $connection->prepare("SELECT table_name FROM information_schema.tables WHERE table_schema='public' AND table_type='BASE TABLE';");
+    $getTablesStatement->execute();
+
+    return array_map(function ($record) {
+        return $record[0];
+    }, $getTablesStatement->fetchAll());
+}
+
+function getTableColumns(PDO $connection, string $tableName) {
+    $getColumnsStatement = $connection->prepare("SELECT column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = :tableName");
+    $getColumnsStatement->bindParam(':tableName', $tableName);
+    $getColumnsStatement->execute();
+    $getColumnsStatement->setFetchMode(PDO::FETCH_NUM);
+
+    return array_map(function ($record) {
+        return $record[0];
+    }, $getColumnsStatement->fetchAll());
+}
+
+$connection = getConnectionFromIniFile(__DIR__ . '/database_parameters.ini');
+$tables = getTables($connection);
+
+foreach ($tables as $table) {
+    $columns[$table] = getTableColumns($connection, $table);
+}
+
+print_r($columns);

postgresql/pdo_pgsql.php

@@ -0,0 +1,18 @@
+<?php
+
+require_once __DIR__.'/get_connection.php';
+
+$connection = getConnectionFromIniFile(__DIR__.'/database_parameters.ini');
+
+$statement = $connection->prepare('select 3');
+$result = $statement->execute();
+
+var_dump($statement->fetchAll());
+
+$sentence = "hello world!";
+
+$statement = $connection->prepare("select :myParameter as greetings");
+$statement->bindParam(':myParameter', $sentence, PDO::PARAM_STR);
+$statement->execute();
+
+var_dump($statement->fetchAll());

time/measure_execution_time/measure_execution_time.php

@@ -15,9 +15,8 @@ function myBigFunction($durationInSeconds)
 $duration = microtime(true) - $start;
 echo "Elapsed time $duration s\n";
 
-
-
+// Snippet
 $start = microtime(true);
 myBigFunction(3);
 var_dump(microtime(true) - $start);
-exit();
+exit();

types/type_check.php

@@ -0,0 +1,21 @@
+<?php
+
+function isAlphaNumeric($value) {
+    return ctype_alnum($value);
+}
+
+$values = [
+    'Hello World!',
+    'apple',
+    '123',
+    '123apple',
+];
+
+foreach ($values as $value) {
+    if (!isAlphaNumeric($value)) {
+        echo "$value is not alphanumeric\n";
+        continue;
+    }
+
+    echo "$value is alphanumeric\n";
+}