Primer

My Primer

The Primer Page has working examples of php within the page. Please look at code for examples.

	Definition	example (Code)	pitfalls
variable	variable are used to store information.	This is a variable being called with php	Make sure to put the dollar sign

	Definition	example (Code)	pitfalls
Strings	a string stores and manupulates text	This phrase is being echoed This phrase is being printed single quotes double quotes	aslo starts with dollar sign

	Definition	example (Code)	pitfalls
PHP code block	Blocks the browser from reading the code	//, /**/	make sure not to block code that is needed

	Definition	example (Code)	pitfalls
Array - Associative	each ID key is associated with a value.	The hometown array says that jane lives in Monteview.	make sure the associated value is what you planned for.

	Definition	example (Code)	pitfalls
Array - Numeric	each ID key is associated with a value.	This numeric array says that I am 21.	make sure the value is what you planned for.

	Definition	example (Code)	pitfalls
Array - Multidemensional	an array that multiple arrays	This Multidemensional array says that I was born 1989-09-16.	make sure the value is what you planned for.

	Definition	example (Code)	pitfalls
Operators - Assignment	to return values after gven values	Addition 7 Subtraction 3 Division 2.5 multiplication 10	Do the math right it might be a good idea to use excel befoe implimenting into the php page.

	Definition	example (Code)	pitfalls
Comparison Operators	To test something	This is a test of an index if the numbers are equal. Index 3 and 4 are the same. This is a test of an index if the numbers are not equal. The indexs that are being comapred are not the same. This is a test if a number is less than 100. The number is smaller than 100. This is a test if a number is greater than 10. The number is larger than 10. This is a test if a number is less than or equal to 100. The number is smaller than 100. This is a test if a number is greater than or equal to 10. The number is larger than 10.	Do the math right it might be a good idea to use excel befoe implimenting into the php page.

Logical Operators

Definition

example

pitfalls and requirements

&, And

both tests are true then it responds true

x=5
y=2

(x <9 && y > 1) returns true

||, Or

two statements on of the statements can be true and it will return true

x=6
y=3

(x==5 || y==5) returns false

! and Not

if none of the statements are true then it will return true

x=5
y=1

!(x==y) returns true

Reference

http://www.w3schools.com/php/php_operators.asp

	Definition	example	pitfalls
Conditional Statements	Conditional statements are used to perform different actions based on different conditions.	if($age[3] > 10){$greater = '<b>The number is larger than 10.</b>';} else {$greater = '<b>The number is smaller than 10.</b>';} switch ($x) { case 1: echo "hair 1"; break; case 2: echo "hair 2"; break; case 3: echo "hair 3"; break; default: echo "No hair between 1 and 3"; }	Do the math right it might be a good idea to use excel befoe implimenting into the php page.

Definition

example

pitfalls

Conditional Statements

Conditional statements are used to perform different actions based on different conditions.

if($age[3] > 10){$greater = 'The number is larger than 10.';}
else
{$greater = 'The number is smaller than 10.';}

switch ($x)
{
case 1:
echo "hair 1";
break;
case 2:
echo "hair 2";
break;
case 3:
echo "hair 3";
break;
default:
echo "No hair between 1 and 3";
}

Do the math right it might be a good idea to use excel befoe implimenting into the php page.

	Definition	examples	pitfalls
Loops	They execute a block of code a number of times. The loops can be counted if you want. They are the workhorse of php	$count = 1; while ($count <= 100){ echo $count."<br/>"; ++$count; foreach ($agearray as $age){ echo $age; } for ($i=1; $i<=3; $i++) { echo "I would be happy if I had this much" . $i . "<br />"; } $i=1; do { $i++; echo "I am this old" . $i . "<br />"; } while ($i<=5);	Make sure to know how many times to loop the file it might stall the browser if loops to many times

Definition

examples

pitfalls

Loops

They execute a block of code a number of times. The loops can be counted if you want. They are the workhorse of php

$count = 1;
while ($count <= 100){
echo $count." ";
++$count;

foreach ($agearray as $age){
echo $age;
}

for ($i=1; $i<=3; $i++)
{
echo "I would be happy if I had this much" . $i . " ";
}

$i=1;
do
 {
 $i++;
 echo "I am this old" . $i . " ";
 }
while ($i<=5);

Make sure to know how many times to loop the file it might stall the browser if loops to many times

Reference = http://www.w3schools.com/php/php_looping.asp