By Andrew Burgess
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Additional info for Getting Good with PHP
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32 Chapter 2 Logical Operators There’s another type of operator to discuss here, and that’s the logical operators. This might be somewhat confusing at first, but you should know them. They’re most useful with conditional statements, so once you learn about those in the next chapter, this part should become much more clear. Before, you meet ’em, remember two things: first, as we’ve seen, many pieces of PHP code return a value. These pieces are called expressions. Second, every value can be interpreted as being either true or false.
You could request that they input the date in a specific format, but there will always be that one person who ignores the rules. This is where the parse_date function will come in handy. It takes a date string and returns to you an associative array with details of the date. Example 3-42 print_r( date_parse("2012-03-07 13:46") ); Here’s part of the output (I’ve omitted a few keys/values relating to the timezone and any error that occurred (none in this case)).
Since those don’t have number indices, it doesn’t make sense to use a normal for-loop. For these, there is another looping construct that works better: the foreach-loop. See here: 44 Chapter 3 Example 3-5 $person = array( "name" => "Sherlock Holmes", "job" => "Private Detective", "birthdate" => "January 6, 1854" ); echo "
- "; foreach($person as $value) { echo "
- $value
"; } echo "
"; Here’s a similar snippet to the one we had with the for-loop. Instead of the for keyword, we use the foreach keyword.