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Understanding String Literals and Operations By: FYICenter.com Part:
  1   2  3  4  A collection of 14 tips on
PHP string literals, operations and conversaion. Clear explanations and
tutorial exercises are provided on single-quoted strings, double-quoted
strings, string elements, concatenation, converting values to strings,
converting strings to values. Topics included in this collections: What
Are the Special Characters You Need to Escape in Single-Quoted Stings? Can
You Specify the "new line" Character in Single-Quoted Strings? How Many
Escape Sequences Are Recognized in Single-Quoted Strings? What Are the
Special Characters You Need to Escape in Double-Quoted Stings? How Many
Escape Sequences Are Recognized in Double-Quoted Strings? How To Include
Variables in Double-Quoted Strings? How Many Ways to Include Variables in
Double-Quoted Strings? How Many Ways to Include Array Elements in
Double-Quoted Strings? How To Access a Specific Character in a String? How
To Assigning a New Character in a String? How To Concatenate Two Strings
Together? How To Compare Two Strings with Comparison Operators? How To
Convert Numbers to Strings? How To Convert Strings to Numbers? What Are
the Special Characters You Need to Escape in Single-Quoted Stings? There
are two special characters you need to escape in a single-quote string:
the single quote (') and the back slash (\). Here is a PHP script example
of single-quoted strings: <?php echo 'Hello world!'; echo 'It\'s
Friday!'; echo '\ represents an operator.'; ?> This script will print:
Hello world!It's Friday!\ represents an operator. Can You Specify the "new
line" Character in Single-Quoted Strings? You can not specify the "new
line" character in a single-quoted string. If you don't believe, try this
script: <?php echo '\n will not work in single quoted strings.'; ?>
This script will print: \n will not work in single quoted strings. How
Many Escape Sequences Are Recognized in Single-Quoted Strings? There are 2
escape sequences you can use in single-quoted strings: \ - Represents the
back slash character. \' - Represents the single quote character. What Are
the Special Characters You Need to Escape in Double-Quoted Stings? There
are two special characters you need to escape in a double-quote string:
the double quote (") and the back slash (\). Here is a PHP script example
of double-quoted strings: <?php echo "Hello world!"; echo "Tom said:
\"Who's there?\""; echo "\ represents an operator."; ?> This script
will print: Hello world!Tom said: "Who's there?"\ represents an operator.
How Many Escape Sequences Are Recognized in Double-Quoted Strings? There
are 12 escape sequences you can use in double-quoted strings: \ -
Represents the back slash character. \" - Represents the double quote
character. $ - Represents the dollar sign. \n - Represents the new line
character (ASCII code 10). \r - Represents the carriage return character
(ASCII code 13). \t - Represents the tab character (ASCII code 9). \{ -
Represents the open brace character. \} - Represents the close brace
character. \[ - Represents the open bracket character. \] - Represents the
close bracket character. \nnn - Represents a character as an octal value.
\xnn - Represents a character as a hex value. How To Include Variables in
Double-Quoted Strings? Variables included in double-quoted strings will be
interpolated. Their values will be concatenated into the enclosing strings.
For example, two statements in the following PHP script will print out the
same string: <?php $variable = "and"; echo "part 1 $variable part 2\n";
echo "part 1 ".$variable." part 2\n"; ?> This script will print: part 1
and part 2 part 1 and part 2 (Continued on next part...) Part:   1
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