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PHP variables
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A symbol for something that changes
PHP variables are A symbol for something that changes What is your name? What day is it?
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A symbol for something that changes
PHP variables are A symbol for something that changes Often the info is stored in a database or submitted by a form online What is your name? What day is it?
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Call upon PHP variables with a $ My name is $name Today is $day
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PHP variables always end line with semi-colon $name=Sarada;
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variable on the left, value on the right
PHP variables assign a value variable on the left, value on the right $name=Sarada;
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strings go in quotes (single or double) $name=Sarada
PHP variables strings go in quotes (single or double) $name=Sarada $description=‘blah di blah blah blah’;
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name it whatever you want, but…
PHP variables name it whatever you want, but… always begin with $ first character after $ can not be a number no spaces (use underscore or camelcase) case-sensitive text (called strings) in quotes numbers need no quotes
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PHP variables examples $word $Word $greenThing $green_thing $word4 do not use reserved words like: $this $function $include etc. list of reserved words:
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once a value is assigned to a variable
PHP variables once a value is assigned to a variable you can display it with echo command <?php echo $name; ?>
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log-in to your student web hosting and choose file manager
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choose “public_html” folder
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choose new file
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name it variables.php
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highlight variables.php click on code editor
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write this: <?php echo “Hello World!”; ?>
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open up your web page/variables.php
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write this: <?php echo “Hello World!”; echo “<br />”;
print “Well hello to you too”; ?>
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refresh your page
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now back to the code editor, write this:
<!doctype html> <html> <head> <title>variables</title> </head> <body> <h1>This is a heading</h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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for this we will link to a separate CSS sheet to make room.
save CSS with extension .css in the site folder Inside the head tags, link to the CSS like this: <link rel="stylesheet" type="text/css" href="name.css">
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<title>variables</title> </head> <body>
Normally variables come from a database, but for now we will hard code them into the page itself. Write this: <!doctype html> <html> <head> <title>variables</title> </head> <body> <?php $name = LaGuardia; ?> <h1>This is a heading</h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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<title>variables</title> </head> <body>
change this: <!doctype html> <html> <head> <title>variables</title> </head> <body> <?php $name = LaGuardia; ?> <h1>This is <?php echo $name;?></h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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mad libs we choose 6 verbs, 6 nouns, 6 adjectives, 1 pronoun you write these variables on the page in-between <?php ?> you choose a text from Blackboard. you fill in the appropriate echo command where specified we read them out loud
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strings otherwise known as text defined inside quotes
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create new file save as strings.php
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<title>strings</title> </head> <body>
Write this, or copy and paste this from last page (change title): <!doctype html> <html> <head> <title>strings</title> </head> <body> <h1>This is a heading</h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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<title>strings</title> </head> <body> <?php
create a simple php string <!doctype html> <html> <head> <title>strings</title> </head> <body> <?php echo “Hello World <br />”; echo ‘Hello World again’; ?> <h1>This is a heading</h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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open up your web page/strings.php
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combine strings together (concatnate) with a ‘
combine strings together (concatnate) with a ‘.’, and create empty space with “ ”: <!doctype html> <html> <head> <title>strings</title> </head> <body> <?php echo “Hello World <br />”; echo ‘Hello World again’; $expression = “Hello”; $subject = “World”; $greeting = $expression . “ ” . $subject; echo $greeting; ?> <h1>This is a heading</h1> <p>this is a paragraph with words and stuff</p> </body> </html>
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place variables inside of strings (only works with double quotes)
<!doctype html> <html> <head> <title>strings</title> </head> <body> <?php echo “Hello World <br />”; echo ‘Hello World again’; $expression = “Hello”; $subject = “World”; $greeting = $expression . “ ” . $subject; echo $greeting; ?> <br /> echo “$greeting one more time”;
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functions
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using functions to manipulate string values
argument to make a string uppercase: strtoupper functions use ( ), don’t forget them <?php $name = LaGuardia; ?> <p>we are in a class at <?php echo $name;?></p> <p>we are in a class at<?php echo strtoupper ($name);?></p> <p>we are in a class at<?php echo strtolower ($name);?></p>
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make one of the nouns uppercase using string to upper argument
strtoupper
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capture the value by making the argument a variable itself
original value <p><?php echo $name;?></p> changed value <p><?php echo strtoupper ($name);?></p> make a variable from changed value <p><?php $changed strtoupper ($name);?></p> <p><?php $changed;?>
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$noun1 = Manhattan Island;
$noun2 = Pineapple; $noun3 = Pizza; $noun4 = Tiger; $noun5 = Apple; $noun6 = Pen; Verb Dream Punch Hear Learn Run Eat Adjective Blindly Kind Pessimistic Mean Fuzzy Loud Pronoun Doctor President Veterinarian
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