if and only if example

... (If only) were could + V Ex: I wish I were on the beach now. If only I were on the beach now. I wish I spoke English well. b- Ước ở tơng lai: S + Wish + S + would + Vinfinitive (If only) ... khụng xy ra hin ti (K 2) If + S + Ved , S + would + V were Ex1: If she had wings, she would fly to an island. Ex2: He would build more houses if he were a king. *Note: - If I were you/I were in ... Ex: If you drink, dont drive - >Ta cú th s dng should mnh iu kin t ý nghi ng. Ex: If he should call, tell him I will ring back. -> Dng rỳt gn mnh iu kin (if possible, if necessary, if...

Ngày tải lên: 29/09/2013, 01:10

... huống như vậy, bạn dùng cấu trúc if+ thì quá khứ (if I knew /if you were /if we didn’t…) nhưng nghĩa của câu là hiện tại không phải quá khứ. Tom would read more if he had more time. (but he doesn’t ... be able to go out) If I were you, I wouldn’t buy that coat hoặc If I was you… Nếu tôi là anh tôi sẽ không mua cái áo khoác đó. I’d go out if it weren’t raining hoặc if it wasn’t raining… ... dùng would ở mệnh đề if: I’d be very frightened if somebody pointed a gun at me. (không nói if somebody would point”) Tôi sẽ rất sợ nếu có ai đó chĩa súng vào tôi. If I didn’t go to their...

Ngày tải lên: 27/10/2013, 22:15

... !"#$ if/ elseif $(%&%#6#3%$+43(%,7+%I$$ if ( expression ){ statements; } elseif ( expression ){ statements; } elseif (expression){ statements; else{ statements; } !"#$ if/ else ... of PHP and MySQL, to make static HTML pages dynamic. The labs and exercises have been tested by myself, Marko, and our students. I think you will find this “by Example book a helpful and complete ... versions and/ or custom covers and content particular to your business, training goals, marketing focus, and branding interests. For more information, please contact: U.S. Corporate and Government...

Ngày tải lên: 24/12/2013, 03:17

... isset() function returns true if a variable has been set and false if it hasn’t. If the variable has been set to NULL or has no value, it returns false. If you want to see if a variable has been set ... The print and echo Constructs So far, we have seen examples using both print and echo to display data. These language constructs can be used interchangeably. The only essential difference between ... $husband = "Honey"; // Assign the value "Honey" to $husband 2 $son = & $husband; // Assign a reference to $son. // Now $son is a reference or alias // for $husband....

Ngày tải lên: 24/12/2013, 03:17

... $x and $y and $z; echo "$x and $y and $z <em>yields</em> " . (int)$result .".\n<br />"; 4 $result = ($x and $y and $z); echo "($x and $y and ... are the logical AND, logical OR, and logical NOT. The symbol for AND is &&, the symbol for OR is ||. The English version for && is and and for || is or. The only difference is that ... * Bitwise Shift Operators The bitwise shift operators take two operands: The first is a quantity to be shifted, and the second specifies the number of bit positions by which the first operand is...

Ngày tải lên: 24/12/2013, 03:17

... “A” is represented as decimal 65 and an uppercase “B” as decimal 66, and so on. On the other hand, a lowercase “a” is 97 and a lowercase “b” is 98, and so on. If you compare “A” to “a,” you can ... than British English. For example, “father” and “farther” do not sound the same in America, nor do “source” and “sauce,” or “tuba” and “tuber.” The only obvious difference between the two functions ... function with a specified width and line break character. Output of Example 6.33. % % If the boolean cut argument is set to 1, the string is always wrapped at the specified width. So if the word...

Ngày tải lên: 24/12/2013, 03:17

... special symbols starting with an ampersand and terminated with a semicolon; for example, the < and > symbols are written as &lt; and &gt;. If the user enters text that contains ... size of the array; for example, if an array has five values, its last index value would be four. See Example 8.5. If the array has been assigned both a key and a value, and the key is a string, ... and how they are used. Chapter 7 Lab Conditional!statements!with !if/ else.!! a. Write an HTML form that asks a user’s age. If he is not at least 21, tell him he’s too young to drink, and if...

Ngày tải lên: 21/01/2014, 09:20

... $colors=array("red","green","blue","yellow"); $random= array_rand($colors); // Returns a random color $random= array_rand($colors, 2); // Returns two random colors print $colors[$random_keys[0]]; print $colors[$random_keys[1]]; ... it a starting random point) the random number as it is now done automatically. Format random_key= array_rand ( array_name ); array_of_keys = array_rand( array_name, integer); Example: $colors=array("red","green","blue","yellow"); ... Output from Example 8.34. 8.1.12. Randomizing an Array Randomizing an array means that you can select the keys or the values in random order. Randomizing the Keys The array_rand() function...

Ngày tải lên: 21/01/2014, 09:20

... specified in the function definition at the other end. If you send three arguments, and there are only two parameters defined within the function, the third argument is ignored. If you send only ... you are only changing the copy. When the function exits, the copy is destroyed. In Example 9.2 the parameters, $m and $g, are copies of the original values of $miles and $gallons. If you give ... Computes!the!difference!of!arrays. array_diff_assoc() Computes!the!difference!of!arrays!with!additional!index!check. array_diff_key() Computes!the!difference!of!arrays!using!keys!for!comparison. array_diff_uassoc() Computes!the!difference!of!arrays!with!additional!index!check! that!is!performed!by!a!user_supplied!callback!function....

Ngày tải lên: 21/01/2014, 09:20

... quotes and backslashes. The PHP script in Example 10.5 demonstrates how the stripslashes() function handles this input. Figure 10.10. The user enters quotes and backslashes. & Example ... require() and include(), the require_once() and include_once() statements, respectively, include and evaluate the specified file during the execution of the script, but require_once() and include_once() ... when a file is included, if the PHP tags are missing, PHP automatically starts processing the included file as an HTML document. The only difference between include() and require() is how they...

Ngày tải lên: 21/01/2014, 09:20

... the filehandle, PHP provides the fopen() function. This function opens a file and returns a filehandle, and if it fails, returns false. It normally takes two arguments: a filename and a mode, ... specifies what kind of operation you want to perform on the file; for example, do you want to read its contents, write to it, read and write, and so on, and this depends on who owns the file and ... Grant%read,%write, %and% execute%to%the%owner,%read %and% execute%to%the%group %and% the%others%(world). 2 Set%all%to%read,%write, %and% execute%on%all%files %and% in%the%current%working% directory. 3 User%gets%read %and% write,%group %and% others%get%read....

Ngày tải lên: 21/01/2014, 09:20

... Output from Example 12.5. ! Pattern-Matching Modifiers A pattern modifier allows you to control the way a pattern match is handled. For example, if you want to search for a pattern and turn ... site and causing havoc. The is_writable() (or is_writeable) function returns true if a file exists and is writable, and false if it is not. Format bool is_writable ( string filename ) % Example: ... exists. It returns TRUE if it does, and FALSE if it does not. Format bool file_exists ( string filename ); % Example: if ( file_exists("filetest.php"); Example 11.17. <html><head><title>Appending</title></head>...

Ngày tải lên: 21/01/2014, 09:20

... pattern love, and would match glove, clove, or love, but not clover. /\blove\b matches a word beginning and ending with the pattern love, and would match only the word love. Example 12.16. ... class. The symbols \d and \D represent a single digit and a single nondigit, respectively (the same as [0-9] and [^0-9]); \w and \W represent a single word character and a single nonword character, ... prepended with ?<=. The text is not captured as in the previous examples, but is only used as criteria for the search. Example 12.41. _29*!a>*6b! (The File moredata.txt Contents) Mama...

Ngày tải lên: 21/01/2014, 09:20

... The AND and OR Operators AND and OR operators are used in a WHERE clause to further qualify what data you want to select from a table. The AND operator tests one or more conditions to see if ... of zero. If a field is NULL, it is empty, and if it is NOT NULL, it has data. Fields have NULL as a default unless they are specified by NOT NULL in the definition of the table. Example 14.9. ... USE Command The USE command makes the specified database your default database. From that point on, all SQL commands will be performed on the default database. This is one of the few commands...

Ngày tải lên: 21/01/2014, 09:20

Ngày tải lên: 21/01/2014, 09:20

Ngày tải lên: 21/01/2014, 09:20

Ngày tải lên: 26/01/2014, 09:20

Ngày tải lên: 26/01/2014, 09:20

Ngày tải lên: 26/01/2014, 09:20

Ngày tải lên: 20/02/2014, 21:20