PHP Tutorial > FOR Loop
FOR is used in PHP to execute the same code a set number of times. The basic syntax of FOR is as follows:
FOR (expression 1, expression 2, expression 3)
{
[code to execute]
}
FOR tells PHP to first execute "expression 1", then evaluate "expression 2". If "expression 2" is true, then [code to execute] is executed. After this, expression 3 is executed, and then "expression 2" is evaluated again. If "expression 2" is true, then [code to execute] is executed for a second time. The cycle continues until "expression 2" is no longer true.
Let's look at an example. Assuming we have the following piece of code:
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FOR ($i = 0; $i <= 2; $i++)
{
print "value is now " . $i . "<br>";
}
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The output of the above code is:
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value is now 0
value is now 1
value is now 2
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During the 1st iteration, $i = 0, which means the expression, ($i <= 2), is true. Therefore, the print statement is executed, and $i gets incremented by 1 and becomes 1.
During the 2nd iteration, $i = 1, which means the expression, ($i <= 2), is true. Therefore, the print statement is executed, and $i gets incremented by 1 and becomes 2.
During the 3rd iteration, $i = 2, which means the expression, ($i <= 2), is true. Therefore, the print statement is executed, and $i gets incremented by 1 and becomes 3.
During the 4th iteration, $i = 3, which means the expression, ($i <= 2), is false. Therefore, PHP exits out of the FOR loop, and does not execute the print statement.
Next: PHP DO WHILE Loop
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