Consider the following PHP fragment:

$int1 = 5;
$int2 = $int1++;
$int3 = $int1++ + $int2++;

What will the variable $int1 contain after each of these statements has executed?

Question

Consider the following PHP fragment:

$int1 = 5;
$int2 = $int1++;
$int3 = $int1++ +  $int2++;

What will the variable $int1 contain after each of these statements has executed?

BlackTom AI · Accepted Answer

We start with: $int1 = 5; $int2 is assigned from $int1++ and then $int3 from the sum of two post-increment expressions.

First statement: $int2 = $int1++;
- The post-increment returns the original value of $int1 (5) and then increments $int1 by 1.
- After this line, $int1 becomes 6, and $int2 is 5.

Second statement: $int3 = $int1++ + $int2++;
- Evaluation happens left to right for the operands of +.
- First operand: $int1++ returns the current value of $int1 (6) and then increments $int1 to 7.
- Second operand: $int2++ returns the current value of $int2 (5) and then increments $int2 to 6.
- The sum is 6 + 5 = 11, so $int3 becomes 11.
- After this line, the variables are: $int1 = 7, $int2 = 6, $int3 = 11.

Third statement: (implied by the question’s sequence) If there were another post-increment on $int1 or $int2, we would continue the same pattern: the next post-increment would return the current value and then increment the variable. However, based on the given three statements, the sequence ends with the third line where $int1 was incremented to 7 in this step and would not be incremented again unless a new statement executes.

Summarizing the value of $int1 after each statement:
- After the first statement, $int1 = 6.
- After the second statement, $int1 = 7.
- After the third statement, $int1 = 8 if there were yet another post-increment, but within the exact third statement as written, the third statement increments $int1 from 7 to 8 as part of evaluating $int1++ in that line, so immediately after the third statement completes, $int1 is 8.

Therefore, the observed sequence for $int1 across the three statements is 6, then 7, then 8. This illustrates how post-increment returns the original value and then increments, and how multiple increments in a single expression are evaluated left-to-right for operands in PHP.

SENG1050 (T3 2025 PSB) Practice Quiz Week 6

Consider the following PHP fragment: $int1 = 5; $int2 = $int1++; $int3 = $int1++ + $int2++; What will the variable $int1 contain after each of these statements has executed?

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