Cheatography
https://cheatography.com
Language basics
script 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');
|
Variables
declaration 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 operations
addition |
$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 ";
$str2 = " stranger!";
Flow control
simple condition |
if (true){
echo("condition pass");
}
|
is var1 equal to var2? |
if ($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 operations
get 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, $array);
|
|
|
Output
simple print |
echo($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($var1 == 1 ? "its 1!" : "its not 1!");
|
Loops
for - classic loop (start instruction; condition on start of each round;end instruction of each round ) |
for ($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 Functions
check 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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