PHP - Foundation

file extension:

.php .php3 .phtml

php block:

<?php … ?>

comment:

//comment
/*…
…
…*/

output:

echo “text”; // can omit ()
print “text”; // can omit ()
print_r(object);
var_dump(object);
gettype()
is_type function

variable:

start with $
follow by alphabet or _
can only contain alphabet, _ or number

string:

$txt1=”Hello World”;
$txt2=’1234′;
echo $txt1 . ” ” . $txt2; // Hello World 1234
echo strlen(“Hello world!”); //12

array:

array(value1[,value2])
array(key => value [,key => value])
key can be integer or string
$a1 = array(“Peter”=>32);
$a1["Peter"] //32
$a2 = array(“Peter”);
$a2[0] //”Peter”

function:

function funcName([param1[,param2]])
{
…
[return ...;]
}

stdClass

$_GET
$_POST
$_COOKIE
$_REQUEST = $_GET + $_POST + $_COOKIE
$_FILES
$_SESSION

include(“file”): if error, will continue to process, but will has warnning message
require(“file”): if error, will stop further process

exit(“exit message”);
die(“exit message”);

A or B: if A is false, execute B

set_error_handler()
trigger_error()
error_log()

set_exception_handler()
throw new Exception(“exception message”);
try
catch

mysql_connect()
mysql_pconnect()
mysql_error()
mysql_select_db()
mysql_query()
mysql_fetch_array()
mysql_close()

odbc_connect()
odbc_exec()
odbc_fetch_row()
odbc_result()
odbc_close()

array_key_exists()
property_exists()
get_class()

$this->
self::
parent::