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The CHECK column constraint only lets you create columns that satisfy the specified check condition. For example, to ensure that a bank account can only be opened with a minimum balance of $100, you could define a column named initial_balance with the following constraint: CHECK (initial_balance >= '100.00'). The table constraints are similar to the column constraints, both in meaning and syntax. However, there is one case in which you must use the table constraints: when you want to apply the UNIQUE or PRIMARY KEY constraints to a combination of columns rather than to a single one. For example, you might need to require that the combination of first and last name be unique within an employee table. You could achieve this result with the following table constraint: UNIQUE (last_name, first_name). The purpose of CONSTRAINT constraint_name is only to associate a unique name to a constraint. This then allows you to remove the constraint by updating the table with the DROP constraint_name element. As you never know whether you ll need to remove a constraint in the future, you should play it safe and name it. If you don t, you might one day have to re-create a table without a constraint and transfer the data from the original constrained version.

s Note Constraints are good to help maintain database integrity, but they reduce flexibility. What you initially considered unacceptable values might turn out to be just unlikely but perfectly valid. Therefore, only create the constraints that you re really sure about. With increasing experience, you ll develop a feel for what s best.

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' ); $importedData = file_get_contents( $uri ); Although this test would catch most attacks, the following input would still be able to bypass it: file:///etc/passwd URIs, like filenames and email addresses, are limited in the set of characters that may constitute them, but hardly at all otherwise They may contain the common http:// protocol marker, or an alternative (like file:// or https://), or none at all; they may point to a top-level domain or many directories down; they may include $_GET variables or not They are just as dangerous as email addresses, for, like them, they represent channels of interaction between your server and the outside world If you allow users to enter them, then you must handle them very carefully..

Displaying the Current Date and Time 231 Supporting Chinese 232 Easier Way to Access Map Elements 237 Internationalizing the Date Display 238 Letting the User Change the Language Used 238 Localizing the Full Stop 243 Displaying a Logo 246 Making the Locale Change Persistent 248 Localizing Validation Messages 250 Summary 251.

CREATE INDEX creates an index for one or more columns in a table. You can use it to improve the speed of data access, in particular when the indexed columns appear in WHERE conditions. See Listing E-13 for a description of its format. Listing E-13. The SQL Statement CREATE INDEX CREATE [UNIQUE] [{ASC[ENDING] | DESC[ENDING]}] INDEX index_name ON tbl_name (col_name [, col_name ...]) ; For example, CREATE UNIQUE INDEX empl_x ON employee_tbl (last_name, first_name) creates an index in which each entry refers to a combination of two field values. Attempts to create employee records with an existing combination of first and last name will fail.

encryption, because the openssl_public_encrypt() function will fail by design if you pass it more than 117 characters to encrypt PHP s OpenSSL module is even more complex than the mcrypt module Since we will be discussing SSL at considerable length in 16, we must for now simply ask you to bear with us when you see such mysterious technical concepts as Certificate Authority and Distinguished Name (You might also find yourself needing to review some of the concepts we discussed earlier in this chapter) The OpenSSL module can create and manage private keys (pkey functions), certificate signing requests (csr functions), and the actual certificates themselves (x509 functions) The module also supports signing and encryption of S/MIME email messages (pkcs7 functions), as well as their verification and decryption It can sign, verify, encrypt, and decrypt values using RSA.

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CREATE VIEW lets you access data belonging to different tables as if each were part of a single table. Only a description of the view is stored in the database, so that no data is physically duplicated or moved. See Listing E-14 for a description of its format.

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