PHP Basic grammar and data type Learning Notes _php Tutorial

An entry-level PHP basic grammar and data type article, I hope you can provide some help PHP beginners OH.

PHP basic syntax and data types:

(1), PHP basic syntax:

1, htm and PHP mixed
2, a statement to; (End of semicolon)
3, how to define a variable, and the use of variables

(2), PHP data operation type

Four types of scalar:
Boolean (Boolean) understood as true and false
Integer (integer type)
Float (floating point type, also "double") understood as decimal type
String (String)

Two kinds of composite types:
Array (arrays)
Object (Objects)

(3) PHP Five types of operations

1. Arithmetic operations

2. Assignment operation (e.g. $a =100)

3. Comparison operations (e.g. $a < $b)

4. Logic operations (e.g. $a && $b)

5, increment the coagulation decrement operation (for example: $a + +)

(4) Switch condition statement

Switch condition statement

$i = 1;

Switch ($i) {
Case 0;
The value of echo "I is 0″;
Break
Case 1;
The value of echo "I is 1″;
Break
Case 2;
The value of echo "I is 2″;
Break
Default:echo "A few values above are not";

}

?>

Break n jump out of a looping statement

Break n jumps out of n-layer loops

Cases:

for ($i =1; $i <=5; $i + +) {
echo "i=". $i. "
”;
for ($j =1; $j <=5; $j + +) {
echo "j=". $j. "
”;
for ($k =1; $k <=5; $k + +) {
echo "k=". $k. "
”;
if ($k ==2) {
Break
}
}
if ($j ==3) {
Break 2;
}

}
echo "
”;
}
?>

(5) Do and loop

Perform a second judgment first
do{
echo "Execution loop";
$a + +;
}while ($a >100);//Note there's a semicolon here.
echo "
”;

Judge and execute first.
while ($a >100) {
echo "Execution loop";
$a + +;
}
?>

Functions commonly used in PHP arrays

foreach ($arr as $key = + $val) {}//traversal array

Count ($arr)//The length of the statistic array

Is_array ($arr)//judgment array

Explode ("key", $STR)//split string array

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