Cheatography
https://cheatography.com
Language basicsscript start | <?php | script end | ?> or nothing | command termination | ; | inline comment | // simple oneliner
| block comment | /* multiline text */
| run script from file (if error throws warning) | include('script.php');
| run script from file (errors are fatal) | require('script.php');
|
Variablesdeclaration without value | $variableName;
| string declaration | $string = "some text";
| integer declaration | $int = 123;
| double declaration | $doble = 1.2
| empty array declaration | $array = array();
| array with elements declaration | $a = array("text",1,2.3);
| boolean declaration | $bool = true;
| null declaration | $empty = null;
|
Variable operationsaddition | $int1 + $int2 -> 12
| divison | 6 / 3 -> 2
| multiplication | 6 * 6 -> 36
| exponentiation | 2 ** 4 -> 16
| substraction | 2 - 1 -> 1
| string + int (string get converted) #1 | "13shits" + 13 -> 26
| string + int (string get converted) #1 | "shitsof13" + 13 -> 13
| string + string | "2dogs" + "5dogs" -> 7
| strings concat | $str1 . $str2 -> hello stranger!
| string and int concat | "numero uno - " . 1; -> numero uno - 1
| unset - delete variable | unset($variable);
|
$int1 = 5;
$int2 = 7;
$str1 = "hello ";
$str2 = " stranger!";
Flow controlsimple condition | if (true){
echo("condition pass");
}
| is var1 equal to var2? | if ($var1 == $var2){
echo("it is.");
} else {
echo("it ins't.")
}
| two vars comperation | ($var1 == $var2)
| is var equal to int? | ($var1 == 4)
| is var lower than int? | ($int < 4)
| is var bigger than int? | ($int > 4)
| is var lower than 5 and not equal to zero | ($int < 5 && $int != 0)
| is string equal to string? | ($str == "dangerous")
| is num 1 or 4? | ($num == 1 || $num == 4)
|
Array operationsget array element by index | $array[index]
| push data to end of array | array_push($array, $data); OR $array[] = $data;
| push data to specific index of array | $array['myColor'] = "#FFF";
| remove & get last element of array | array_pop($array);
| get count of elements in array | count($array);
| is specific value in array? | in_array($needle, $array);
|
| | Outputsimple print | echo($variable . " and some text");
| simple print #2 | echo 1;
| simple print #3 (must be without parentheses) | echo 1,2; -> 12
| print multiple lines | echo("line1\nline2\n");
| print variable type and data | print_r($var);
| print variable type and data (detailed) | var_dump($var);
| conditional printing | echo($var1 == 1 ? "its 1!" : "its not 1!");
|
Loopsfor - classic loop (start instruction; condition on start of each round;end instruction of each round ) | for ($i = 1; $i <= 10; $i++) {
echo $i;
}
| foreach - do something for each element in array | foreach($array as $arrayElement){
var_dump($arrayElement;)
}
| while - do something if cond is true again and again if is still true | while(true){
echo("infinity!");
}
| break - escape from loop | break;
| continue - skip current round | continue;
|
PHP Filesystem Functionscheck if file exists | file_exists("/root/file.txt");
| open a file for reading only | $file = fopen("./../file.txt", "r");
| get size of file in bytes | filesize("file.txt");
| print all bytes from fopened file | echo fread($file, filesize("file.txt"));
| open a file for reading only | $file = fopen("./../file.txt", "w");
| write to fopened file | fwrite($file, "some text\n");
| close file after all operations | fclose($file);
| oneline file write | file_put_contents($filename, $data);
| oneline file read | $fileContent = file_get_contents($fileName);
| fopen() modes (second argument) | r = Read
r+ = Read,write and prepend
w = Write, truncate
w+ = Read and write, truncate a Write, append
a+ = Read and write, append |
Useful variables$_SERVER | Server and execution environment information | $_SERVER['SERVER_ADDR'] | Server IP | $_SERVER['REQUEST_METHOD'] | Which request method was used to access the page; i.e. 'GET', 'HEAD', 'POST', 'PUT' | $_SERVER['HTTP_USER_AGENT'] | User-Agent: header from the current request | $_SERVER['REMOTE_ADDR'] | The IP address from which the user is viewing the current page | __FILE__ | The full path and filename of the current script file | __DIR__ | The directory of the file | __LINE__ | Current line number in script file | $_GET | Associative array of variables passed to the current script via the URL parameters | $_POST | An associative array of variables passed to the current script via the HTTP POST method when using application/x-www-form-urlencoded or multipart/form-data as the HTTP Content-Type in the request | $_FILES | An associative array of items uploaded to the current script via the HTTP POST method |
|
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