PHPBuilder - Strings & Text in PHP - The ABCs of PHP Part 5 Page 4

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Strings & Text in PHP - The ABCs of PHP Part 5 - Page 4

by: PHP Builder Staff
April 15, 2009

The remaining sequences \\ \$ \" & \' are all to allow those characters to be printed in your string. This is important, because as we have seen already if we use those characters they have special meaning. Also please note that a ' can be used in a string if the string is enclosed by " and vice versa.
This can be very important especially when you are outputting HTML to a web page, as web page tags need enclosing parentheses around any attributes specified in the tags, EG:

  Print "<img src='mypic.jpg' alt='My Picture'/>";

To output an image tag. You can also do this the other way:

  Print '<img src="mypic.jpg" alt="My Picture"/>';

The first way seems to be the most used, I'm guessing because of the variable substitution ability, EG:

  $mypic = 'images/mypic.jpg';

  Print "<img src='$mypic' alt='My Picture'/>";

Don't be fooled by the $mypic being surrounded by '', if you look at the whole line it's the "" that matter, the inner '' will be ignored.
What next?
Well now you understand what strings are and how you can use them, it's time to start reading the PHP manual page on string functions, this can be found at .types.string.php.
PHP has a huge amount of functions built into it for handling strings, unfortunately I don't have the space here to go over them all. The PHP manual link above has excellent descriptions of what each of the functions do, as always I encourage you to explore them and see what they do.
Don't worry if you use a function and it doesn't work as expected, play with the code until it does. It's all about playing with the code and understanding what does what.
Until next time
Don't tangle your strings. Check back next week when we'll cover numbers & maths.

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