| Php control structures: | |
| << h o m e | |
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:::>Trinary
operator:
Test
expression ? Yes-expression : no-expression
tests
the 'test expression' & if it is true evaluates & returns 'yes expression';
if the test expression is false the 'no expession' is evaluated & returned.
Same
as:
If
(test expression){
Yes
expression
}
else {
No
expression
}
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:::>if
If
(conditions){
//stuff
to do
}
--or--
If
(conditions){
//stuff
to do
}
else {
//stuff
to do
}
--or--
If
(conditions){
//stuff
to do
}
elseif (conditions 2){
//stuff to do
}
else {
//stuff
to do
}
If
the 'conditions' evaluate to true, the '//stuff to do' is done
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:::>while
While
(conditions){
//stuff
to do
}
Evaluates
'conditions' and runs the code in the brackets as long as the 'conditions'
are true
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:::>do
while
Do
//stuff to do
while (conditions)
alot
like 'while' but the stuf is done at least once and then the 'conditions'
are evaluated to determine whether or not to 'do' again...
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:::>for
For
(initial-expression;termination-check;loop-end-expression){
//stuff
to do
}
Sets
the 'initial expression', make s sure that the 'termination-check' is true,
deis the '//stuff to do', then evaluates the 'loop-end-eypression'.
A
common example is a counter:
for
(i=0;i<10;i++){
//will
print $i 10 times
Echo
('vartable i =' .$i);
}
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:::>switch
Switch
(expression)
{
Case
value-1:
//stuff to do if 'expression' is equal
to
break; // 'break' is optional
Case
value-2:
//stuff to do if 'expression' is equal
to
break; // 'break' is optional
Case
value-3:
//stuff to do if 'expression' is equal
to
break; // 'break' is optional
//default
is optional
Default:
//stuff to do in default situation
break; // 'break' is optional
}
Evaluates
'expression' & compares the value to the value in each 'case statement'.
If a match is found the '//stuff to do' is
executed and the comparison contiues until a break statement or the end of
the switch statement...
An
elegant piece of code
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:::>Exit()
Exit()
Terminates
the execution of the script immediately...
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:::>die()
Die('optional
message string')
Sends
the 'optional message string' to output, then terminates the execution of
the script
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