create array_keys_exists, array_keys, dirname, explode, implode, in array, sprintf, strpos, substr

Author: BaseMax

array_key_exists.php

@@ -0,0 +1,14 @@
+<?php
+// array_key_exists
+$list = [
+    "a",
+    "b",
+    "c"
+];
+var_dump(array_key_exists("a", $list));
+var_dump(array_key_exists("x", $list));
+// Error: var_dump(array_key_exists($list, "x"));
+
+var_dump(array_key_exists("0", $list));
+var_dump(array_key_exists("10", $list));
+

array_keys.php

@@ -0,0 +1,40 @@
+<?php
+// array_keys
+$list = [
+    "a",
+    "b",
+    "c"
+];
+print_r(array_keys($list));
+
+$list = [
+    1=>"a",
+    5=>"b",
+    10=>"c"
+];
+print_r(array_keys($list));
+
+$list = [
+    "a",
+    5=>"b",
+    "c"
+];
+print_r($list);
+print_r(array_keys($list));
+
+$list = [
+    "a",
+    "sallam"=>"b",
+    "c"
+];
+print_r($list);
+print_r(array_keys($list));
+
+$list = [
+    "a",
+    3=>"xx",
+    "sallam"=>"b",
+    "c"
+];
+print_r($list);
+print_r(array_keys($list));

array_merge.php

@@ -0,0 +1,24 @@
+<?php
+// array_merge
+$list1 = [
+    "a",
+    "b",
+    "c"
+];
+$list2 = [
+    "d",
+    "e",
+    "f"
+];
+// Nothing: array_merge($list1, $list2);
+$list3 = array_merge($list1, $list2);
+print_r($list3);
+
+$list4 = [];
+foreach ($list1 as $item) {
+    $list4[] = $item;
+}
+foreach ($list2 as $item) {
+    $list4[] = $item;
+}
+print_r($list4);

dirname.php

@@ -0,0 +1,14 @@
+<?php
+var_dump(dirname("c:\\path\\to\\file.txt"));
+var_dump(dirname("file.txt"));
+var_dump(dirname("../file.txt"));
+
+$files = glob("c:\\xampp\\htdocs\\TopPHPFunctions\\*.php");
+print_r($files);
+foreach ($files as $file) {
+    print dirname($file) . "\n";
+}
+
+var_dump("c:\\xampp\\htdocs\\TopPHPFunctions\\aaa.php");
+var_dump(dirname("c:\\xampp\\htdocs\\TopPHPFunctions\\aaa.php"));
+

explode.php

@@ -0,0 +1,8 @@
+<?php
+// explode
+$str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi nisi euismod nisi. Donec euismod, nisl eget consectetur consectetur, nisi nisl aliquet nisi, euismod euismod nisi";
+$list = explode(" ", $str);
+var_dump($list);
+
+$str = implode(" ", $list);
+var_dump($str);

implode.php

@@ -0,0 +1,18 @@
+<?php
+var_dump(
+    implode("\n", [
+        "a",
+        "b",
+        "c"
+    ])
+);
+
+$str = "";
+$list = ["a", "b", "c"];
+foreach($list as $item) {
+    $str = $str . $item;
+    if ($item !== $list[count($list)-1]) {
+        $str .= "\n";
+    }
+}
+var_dump($str);

in_array.php

@@ -0,0 +1,17 @@
+<?php
+// in_array
+$list = [
+    "a",
+    "b",
+    "c"
+];
+var_dump(in_array("a", $list));
+var_dump(in_array("x", $list));
+// Error: var_dump(in_array($list, "x"));
+
+$res = false;
+$looking_for = "x";
+foreach ($list as $item) {
+    if ($item === $looking_for) $res = true;
+}
+var_dump($res);

sprintf.php

@@ -0,0 +1,74 @@
+<?php
+// sprintf
+// %d
+// %s
+// %f
+$str = sprintf("%s %s", "Hello", "World");
+var_dump($str);
+
+$str = sprintf("%s<---->%s", "Hello", "World");
+var_dump($str);
+
+$str = sprintf("hi, there, it's me? HOW ARE YOU?\n%s (%d)", "Hello", 100);
+var_dump($str);
+
+$str = sprintf("hi, there, it's me? HOW ARE YOU?");
+var_dump($str);
+
+$str = "Hello" . " " . "World";
+var_dump($str);
+
+$age = 100;
+$str = "Hello $age";
+var_dump($str);
+
+function testme() {
+    return "MAX";
+}
+
+$age = 100;
+$str = "Hello $age" . testme();
+var_dump($str);
+
+$age = 100;
+$str = "Hello {$age} testme()";
+var_dump($str);
+
+$list = [
+    "ali",
+    "reza",
+    "hamid"
+];
+$str = "Hello {$list[0]} {$list[1]} {$list[2]}";
+var_dump($str);
+
+// $age = 10;
+// Error: $str = "$agehi";
+// var_dump($str);
+
+$age = 10;
+$str = "$age hi";
+var_dump($str);
+
+$age = 10;
+$str = "$age" . " hi";
+var_dump($str);
+
+$age = 10;
+$str = $age . " hi";
+var_dump($str);
+
+$age = 10;
+$str = "{$age}hi";
+var_dump($str);
+
+
+var_dump(sprintf("%d", "100"));
+var_dump(sprintf("%f", 3.14));
+var_dump(sprintf("%g", 3.14));
+var_dump(sprintf("%.3f", 3.14));
+var_dump(sprintf("%.3f", 10));
+
+// string	s
+// int	d, u, c, o, x, X, b
+// float	e, E, f, F, g, G, h, H

strpos.php

@@ -0,0 +1,23 @@
+<?php
+// strpos
+$str = "Hello World o o o o  o";
+var_dump(strpos($str, "o"));
+var_dump(strpos($str, "o", 4));
+var_dump(strpos($str, "o", 4+1));
+
+$looking_for = "o";
+$offset = 0;
+while (true) {
+    $offset = strpos($str, $looking_for, $offset);
+    if ($offset === false) break;
+    $offset++;
+    var_dump($offset);
+}
+
+$str = "Hello World o o o o  o";
+$pos = strpos($str, "o");
+var_dump($pos);
+$str = substr($str, $pos+1);
+var_dump($str);
+$pos = strpos($str, "o");
+var_dump($pos);

substr.php

@@ -0,0 +1,13 @@
+<?php
+// substr
+$string = "abcdefghijklmnopqrstuvwxyz";
+var_dump(substr($string, 0, 3));
+var_dump(substr($string, 3, 3));
+var_dump(substr($string, -3, 3));
+var_dump(substr($string, -3, -1));
+var_dump(substr($string, -3, -2));
+var_dump(substr($string, -3, -3));
+var_dump(substr($string, -3, -5));
+var_dump(substr($string, -3, -50000));
+
+var_dump(substr(null, -3, -50000));