<?php
session_start();
$code=rand(1000,9999);
$_SESSION["code"]=$code;
$im = imagecreatetruecolor(50, 24);
$bg = imagecolorallocate($im, 22, 86, 165); //background color blue
$fg = imagecolorallocate($im, 255, 255, 255);//text color white
imagefill($im, 0, 0, $bg);
imagestring($im, 5, 5, 5, $code, $fg);
header("Cache-Control: no-cache, must-revalidate");
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
<?php
function encrypt( $q ) {
$cryptKey = 'qJB0rGtIn5UB1xG03efyCp';
$qEncoded = base64_encode( mcrypt_encrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), $q, MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ) );
return( $qEncoded );
}
function decrypt( $q ) {
$cryptKey = 'qJB0rGtIn5UB1xG03efyCp';
$qDecoded = rtrim( mcrypt_decrypt( MCRYPT_RIJNDAEL_256, md5( $cryptKey ), base64_decode( $q ), MCRYPT_MODE_CBC, md5( md5( $cryptKey ) ) ), "\0");
return( $qDecoded );
}
?>
----------------------------------------------------------------------------------------------------------------------------
<?php
$id = "USR13";
$Encrypted = encrypt($id);
$Decrypted = decrypt($Encrypted);
?>
<a href="index.php?id=<?php echo $Encrypted?>">Enkrip</a>
<a href="index.php?id=<?php echo $Decrypted?>">Dekript</a>
?>
1. Cek Posisi Mouse
var y = window.pageYOffset;
var x = window.pageXOffset;
console.log(`mouse location = X: ${e.x}, Y: ${e.y}`)
})
2. Set Default Offset Page
function up() {
window.pageYOffset = 0;
}
1. Cara Pertama
const arr = [1, 2, 3, 4];
sum = arr.reduce((a, b) => a + b, 0);
console.log(sum)
1. Menjumlahkan array sisi kanan dan sisi kiri dari sebuah index
function findEvenIndex(arr)
{
for(let i = 0; i < arr.length; i++) {
let leftTotal = arr.slice(0, i).reduce((t, v) => t + v, 0);
let rightTotal = arr.slice(i + 1).reduce((t, v) => t + v, 0);
if (leftTotal === rightTotal) {
return leftTotal; // find total left or right
}
}
return -1;
}
console.log(findEvenIndex([1,2,3,4,5,4,3,2,1]))
2. Mencari sebuah index dari array
function findEvenIndex(arr) {
let index = -1;
for (var i = 0; i < arr.length; i++) {
let start = arr.slice(0, i+1).reduce((a, b) => a + b, 0);
let end = arr.slice(i).reduce((a, b) => a + b, 0)
if (start === end) {
index = i
}
}
return index;
}
console.log(findEvenIndex([1,2,3,4,3,2,1]))
function XO(str) {
var x = [];
var o = [];
for (var i = 0; i < str.length; i++) {
if (str[i].toLowerCase() === 'x') {
x.push(str[i]);
} else if (str[i].toLowerCase() === 'o') {
o.push(str[i]);
}
}
if (x.length == o.length) {
return true;
} else {
return false;
}
}
console.log(XO('xo'));
console.log(XO('xxo'));
console.log(XO('xoX'));
console.log(XO('xoOX'));
function capitalize(str) {
strVal = '';
str = str.split(' ');
for (var chr = 0; chr < str.length; chr++) {
strVal += str[chr].substring(0, 1).toUpperCase() + str[chr].substring(1, str[chr].length) + ' '
}
return strVal;
}
console.log(capitalize('hello world post'));
1. Form
<input type="radio" name="usia" value="Gen X">
<input type="radio" name="usia" value="Gen Z">
<button onclick="check()">check</button>
2. Javascript
function check(){
var usia = document.querySelector('[name=usia]:checked').value;
console.log(usia)
}
1. Form
<input type="checkbox" name="nama[]" value="robert">
<input type="checkbox" name="nama[]" value="edward">
<button onclick="check()">Check</button>
2. javascript
function check() {
var list = [];
var cboxes = document.getElementsByName('nama[]');
var len = cboxes.length;
for (var i = 0; i < len; i++) {
if(cboxes[i].checked){
list.push(cboxes[i].value)
}
}
console.log(list.join(",").toString());
}
function isPrime(nums) {
if(nums < 2 ){
return false;
}
for(let i = 2; i < nums; i++){
if(nums % i == 0){
return false // modulus
}
}
return true;
}
console.log(isPrime(2)) true
console.log(isPrime(4)) false
console.log(isPrime(5)) true
console.log(isPrime(6)) false
console.log(isPrime(7)) true
console.log(isPrime(9)) false
