Description:
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I would like to report about "Example #1 Associativity" on the following docs 
page, because it is very confusing:
http://www.php.net/manual/en/language.operators.precedence.php

1. According to operators precedence table, "++" operator precedence is MUCH MORE 
higher then "+" one. As i understand, exactly pre-increment, because post-
increment is always executed last one (table with precedence order is not correct, 
eh? do we need to separate pre-increments and post-increments there?)

2. According to http://www.php.net/manual/en/language.operators.increment.php 
page, there should be following scenario for your example:

- $a variable is pre-incremented (becomes $a = 2)
- sum is calculated for $a + $a variables (4 number will be printed by echo)
- $a variable is post-incremented (becomes $a = 3)

Test script:
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// mixing ++ and + produces undefined behavior - WTF? result should always be 4
$a = 1;
echo ++$a + $a++; // may print 4 or 5