Cheatography
https://cheatography.com
Language basics
script start |
<?php |
script end |
?> or nothing |
command termination |
; |
inline comment |
|
block comment |
|
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 |
|
string declaration |
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integer declaration |
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double declaration |
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empty array declaration |
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array with elements declaration |
$a = array("text",1,2.3);
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boolean declaration |
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null declaration |
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Variable operations
addition |
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divison |
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multiplication |
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exponentiation |
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substraction |
|
string + int (string get converted) #1 |
|
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 |
|
$int1 = 5;
$int2 = 7;
$str1 = "hello ";
$str2 = " stranger!";
Flow control
simple condition |
if (true){
echo("condition pass");
}
|
is var1 equal to var2? |
if ($var1 == $var2){
echo("it is.");
} else {
echo("it ins't.")
}
|
two vars comperation |
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is var equal to int? |
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is var lower than int? |
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is var bigger than int? |
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is var lower than 5 and not equal to zero |
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is string equal to string? |
($str == "dangerous")
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is num 1 or 4? |
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Array operations
get array element by index |
|
push data to end of array |
array_push($array, $data);
OR $array[] = $data;
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push data to specific index of array |
$array['myColor'] = "#FFF";
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remove & get last element of array |
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get count of elements in array |
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is specific value in array? |
in_array($needle, $array);
|
|
|
Output
simple print |
echo($variable . " and some text");
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simple print #2 |
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simple print #3 (must be without parentheses) |
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print multiple lines |
echo("line1\nline2\n");
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print variable type and data |
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print variable type and data (detailed) |
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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 |
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continue - skip current round |
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PHP Filesystem Functions
check if file exists |
file_exists("/root/file.txt");
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open a file for reading only |
$file = fopen("./../file.txt", "r");
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get size of file in bytes |
filesize("file.txt");
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print all bytes from fopened file |
echo fread($file, filesize("file.txt"));
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open a file for reading only |
$file = fopen("./../file.txt", "w");
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write to fopened file |
fwrite($file, "some text\n");
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close file after all operations |
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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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