<?php
function getRandomId($min = NULL, $max = NULL) {
    if (is_numeric($min) && is_numeric($max)) {
        return mt_rand($min, $max);
    }
    else {
        return mt_rand();
    }
}
?>

<?php
echo '
<select id="modeEl" size="1">
   <option value="abap">ABAP</option>
   <option value="abc">ABC</option>
   <option value="actionscript">ActionScript</option>
   <option value="ada">ADA</option>
   <option value="alda">Alda</option>
   <option value="apache_conf">Apache Conf</option>
   <option value="apex">Apex</option>
   <option value="aql">AQL</option>
   <option value="asciidoc">AsciiDoc</option>
   <option value="asl">ASL</option>
   <option value="assembly_x86">Assembly x86</option>
   <option value="autohotkey">AutoHotkey / AutoIt</option>
   <option value="batchfile">BatchFile</option>
   <option value="c_cpp">C and C++</option>
   <option value="c9search">C9Search</option>
   <option value="cirru">Cirru</option>
   <option value="clojure">Clojure</option>
   <option value="cobol">Cobol</option>
   <option value="coffee">CoffeeScript</option>
   <option value="coldfusion">ColdFusion</option>
   <option value="crystal">Crystal</option>
   <option value="csharp">C#</option>
   <option value="csound_document">Csound Document</option>
   <option value="csound_orchestra">Csound</option>
   <option value="csound_score">Csound Score</option>
   <option value="css">CSS</option>
   <option value="curly">Curly</option>
   <option value="d">D</option>
   <option value="dart">Dart</option>
   <option value="diff">Diff</option>
   <option value="dockerfile">Dockerfile</option>
   <option value="dot">Dot</option>
   <option value="drools">Drools</option>
   <option value="edifact">Edifact</option>
   <option value="eiffel">Eiffel</option>
   <option value="ejs">EJS</option>
   <option value="elixir">Elixir</option>
   <option value="elm">Elm</option>
   <option value="erlang">Erlang</option>
   <option value="forth">Forth</option>
   <option value="fortran">Fortran</option>
   <option value="fsharp">FSharp</option>
   <option value="fsl">FSL</option>
   <option value="ftl">FreeMarker</option>
   <option value="gcode">Gcode</option>
   <option value="gherkin">Gherkin</option>
   <option value="gitignore">Gitignore</option>
   <option value="glsl">Glsl</option>
   <option value="gobstones">Gobstones</option>
   <option value="golang">Go</option>
   <option value="graphqlschema">GraphQLSchema</option>
   <option value="groovy">Groovy</option>
   <option value="haml">HAML</option>
   <option value="handlebars">Handlebars</option>
   <option value="haskell">Haskell</option>
   <option value="haskell_cabal">Haskell Cabal</option>
   <option value="haxe">haXe</option>
   <option value="hjson">Hjson</option>
   <option value="html">HTML</option>
   <option value="html_elixir">HTML (Elixir)</option>
   <option value="html_ruby">HTML (Ruby)</option>
   <option value="ini">INI</option>
   <option value="io">Io</option>
   <option value="jack">Jack</option>
   <option value="jade">Jade</option>
   <option value="java">Java</option>
   <option value="javascript">JavaScript</option>
   <option value="json">JSON</option>
   <option value="json5">JSON5</option>
   <option value="jsoniq">JSONiq</option>
   <option value="jsp">JSP</option>
   <option value="jssm">JSSM</option>
   <option value="jsx">JSX</option>
   <option value="julia">Julia</option>
   <option value="kotlin">Kotlin</option>
   <option value="latex">LaTeX</option>
   <option value="latte">Latte</option>
   <option value="less">LESS</option>
   <option value="liquid">Liquid</option>
   <option value="lisp">Lisp</option>
   <option value="livescript">LiveScript</option>
   <option value="logiql">LogiQL</option>
   <option value="lsl">LSL</option>
   <option value="lua">Lua</option>
   <option value="luapage">LuaPage</option>
   <option value="lucene">Lucene</option>
   <option value="makefile">Makefile</option>
   <option value="markdown">Markdown</option>
   <option value="mask">Mask</option>
   <option value="matlab">MATLAB</option>
   <option value="maze">Maze</option>
   <option value="mediawiki">MediaWiki</option>
   <option value="mel">MEL</option>
   <option value="mips">MIPS</option>
   <option value="mixal">MIXAL</option>
   <option value="mushcode">MUSHCode</option>
   <option value="mysql">MySQL</option>
   <option value="nginx">Nginx</option>
   <option value="nim">Nim</option>
   <option value="nix">Nix</option>
   <option value="nsis">NSIS</option>
   <option value="nunjucks">Nunjucks</option>
   <option value="objectivec">Objective-C</option>
   <option value="ocaml">OCaml</option>
   <option value="pascal">Pascal</option>
   <option value="perl">Perl</option>
   <option value="pgsql">pgSQL</option>
   <option value="php">PHP</option>
   <option value="php_laravel_blade">PHP (Blade Template)</option>
   <option value="pig">Pig</option>
   <option value="powershell">Powershell</option>
   <option value="praat">Praat</option>
   <option value="prisma">Prisma</option>
   <option value="prolog">Prolog</option>
   <option value="properties">Properties</option>
   <option value="protobuf">Protobuf</option>
   <option value="puppet">Puppet</option>
   <option value="python">Python</option>
   <option value="qml">QML</option>
   <option value="r">R</option>
   <option value="raku">Raku</option>
   <option value="razor">Razor</option>
   <option value="rdoc">RDoc</option>
   <option value="red">Red</option>
   <option value="rhtml">RHTML</option>
   <option value="rst">RST</option>
   <option value="ruby">Ruby</option>
   <option value="rust">Rust</option>
   <option value="sass">SASS</option>
   <option value="scad">SCAD</option>
   <option value="scala">Scala</option>
   <option value="scheme">Scheme</option>
   <option value="scss">SCSS</option>
   <option value="sh">SH</option>
   <option value="sjs">SJS</option>
   <option value="slim">Slim</option>
   <option value="smarty">Smarty</option>
   <option value="smithy">Smithy</option>
   <option value="snippets">snippets</option>
   <option value="soy_template">Soy Template</option>
   <option value="space">Space</option>
   <option value="sql">SQL</option>
   <option value="sqlserver">SQLServer</option>
   <option value="stylus">Stylus</option>
   <option value="svg">SVG</option>
   <option value="swift">Swift</option>
   <option value="tcl">Tcl</option>
   <option value="terraform">Terraform</option>
   <option value="tex">Tex</option>
   <option value="text">Text</option>
   <option value="textile">Textile</option>
   <option value="toml">Toml</option>
   <option value="tsx">TSX</option>
   <option value="twig">Twig</option>
   <option value="typescript">Typescript</option>
   <option value="vala">Vala</option>
   <option value="vbscript">VBScript</option>
   <option value="velocity">Velocity</option>
   <option value="verilog">Verilog</option>
   <option value="vhdl">VHDL</option>
   <option value="visualforce">Visualforce</option>
   <option value="wollok">Wollok</option>
   <option value="xml">XML</option>
   <option value="xquery">XQuery</option>
   <option value="yaml">YAML</option>
   <option value="zeek">Zeek</option>
   <option value="django">Django</option>
</select>
';
?>

<?php
   $json ='{"id":1,"name":"foo","interest":["wordpress","php"]}';
   $obj=json_decode($json);
   echo $obj->interest[1]; //prints php
?>

<?php

function uniqidReal($length = 8) {
    // uniqid gives 8 chars, can be changed
    if (function_exists("random_bytes")) {
        $bytes = random_bytes(ceil($length / 2));
    } elseif (function_exists("openssl_random_pseudo_bytes")) {
        $bytes = openssl_random_pseudo_bytes(ceil($length / 2));
    } else {
        throw new Exception("no cryptographically secure random function available");
    }
    return substr(bin2hex($bytes), 0, $length);
}

/*
//for testing
for($i = 0; $i < 10; $i++) {
  echo "<br>";
  echo uniqidReal();
}
*/
?>

<?php
$username = "Austin Leath -_#";
$username_err = "no error";
if(preg_match('/[^a-z_\-0-9]/i', $string)) {
  $username_err = "Username can only contain alphanumeric characters, dashes, and underscores.";
}

echo $username_err
?>

<?php
$im = imagecreatefrompng('example.png');
$size = min(imagesx($im), imagesy($im));
$im2 = imagecrop($im, ['x' => 0, 'y' => 0, 'width' => $size, 'height' => $size]);
if ($im2 !== FALSE) {
    imagepng($im2, 'example-cropped.png');
    imagedestroy($im2);
}
imagedestroy($im);
?>