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PHP Syntax for beginners Cheat Sheet by

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php     mysql     sql     database     regular     expressions     beginner     syntax     loops

connection to mysql database

Connect to the database
$dbc = mysqli­_co­nne­ct(­HOST, USER, PW, DB);
Query the database
$result = mysqli­_qu­ery­($dbc, $query);
Close the connection
mysqli­_cl­ose­($dbc);

PHP functions

isset()
test for variable exists
empty()
test for empty variable
mail($to, $subject, $msg, 'From: ' . $email)
mail function
mysqli­_fe­tch­_ar­ray­($r­esult)
fetch each row of a query (in $result)
header()
send a header from the server
is_num­eric()
test to see if a value is number
exit()
causes script to stop immedi­ately
trim($­string)
trims leading and trailing spaces
mysqli­_re­al_­esc­ape­_st­rin­g($­string)
escapes special characters
str_re­pla­ce('a', 'b', $string)
replace a with b in a string
explode(', ' , $string)
make string into array
implode(', " $string)
make array into string
substr ($string, start, len)
grabs a substring
preg_m­atc­h('­regex', $string)
matches regular expres­sions
preg_r­epl­ace­('r­egex', $replace, $string)
replaces characters in a string by regex
 

IF syntax

if (condi­tion) {
... }
elseif (condi­tion) {
... }
else {
... }

Loops

FOR loop
for (initi­alize; condition; update) { ... }
WHILE loop
while (condi­tion) { ... }
FOREACH loop
foreach ($array as $value) { ... }
DO WHILE
do { ... ;} while (condi­tion)
FOR (loop until a condition is met)
WHILE (loop through query results)
FOREACH (loop through an array)

CONTINUE

for ($i = 0; $i < 5; ++$i) {
if ($i == 2)
continue;
print "$i , ";
}
produces the following output:
0 , 1 , 3 , 4

SWITCH syntax

SWITCH ($s) {
case 1:
...
break;
case 2:
...
break;
default:
...
}
can be used with numbers, or strings
 

Regular Expres­sions

^
start of string
\d
number from 0 to 9
\s
whitespace
.
any letter or digit or whitespace
\w
any alphan­umeric [0-9A-­Za-z]
$
end of string
( )
group
[ ]
character class
{x} {x,} {x,y}
x of | x or more of | x to y of
|
or
*
none or more
?
none or one
+
one or more
\
escape

Arrays

Create
$myArray = array();
Push into
$myArray[] = "­Som­eth­ing­";
Push to associ­ative
$myArr­ay[­'key'] = "­Val­ue";
Create numeric
$myArray = array(­'va­lue', 'value2');
Create associ­ative
$a = array(­'ke­y'=­>'v­al');
Print from numeric
echo $myArr­ay[0];
Print from associ­ative
echo $myArr­ay[­'key'];
Associ­ative arrays
Keys are strings
Numeric arrays
Keys are numbers: 0,1,2,3,4

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Comments

Bryan Bryan, 10:53 11 May 14

use php PDO for database access. the call show here is dinosaur age and dangerous.

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