Source: Internet
Author: User
Tags php operator
\$a = 10;
\$b = ' 60 ';
echo "\$a + \$b =". \$a + \$b. "
";
echo "\$a-\$b =". \$a-\$b. "
";
echo "\$a \$b = ". \$a\$b. "
";
echo "\$a/\$b =". \$a/\$b. "
";
?>

The last page output has the following values:
70
-50
10*60=600
10/60=0.16666666666667

How are these values derived?

\$a = 10;
\$b = ' 60 ';
echo "\$a + \$b =". \$a + \$b. "
";
echo "\$a-\$b =". \$a-\$b. "
";
echo "\$a\$b =". \$a\$b. "
";
echo "\$a/\$b =". \$a/\$b. "
";
?>

The last page output has the following values:
70
-50
10*60=600
10/60=0.16666666666667

How are these values derived?

echo "\$a + \$b =". \$a + \$b. "
"; execution result (+-) is the same level of execution order left to right)

``"\$a+\$b=" => '10+60='"\$a+\$b=".\$a => '10+60=10'("\$a+\$b=".\$a) + \$b => intval('10+60=10') + intval(\$b) => 10+60 =>70``

Click to view PHP operator precedence

\$a is the integer type, stored in PHP as Long, \$b is a string, when doing arithmetic operations to cast to an integer, the division of the decimal number is stored in double, the rest is mathematical transport forget

Basic operation: Subtraction

In this case, the string is automatically converted into an shaping engagement operation

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