Here is the list of 43 short tips you can use for writing an optimized and more efficient PHP code:

1. If a method can be static, declare it static. Speed improvement is by a factor of 4.
   

2. echo

   is faster than

   print

   .
   
3. Use echo's multiple parameters instead of string concatenation.
   
4. Set the maxvalue for your for-loops before and not in the loop.
   
5. Unset your variables to free memory, especially large arrays.
   
6. Avoid magic like __get, __set, __autoload
   

7. require_once()

   is expensive
   
8. Use full paths in includes and requires, less time spent on resolving the OS paths.
   
9. If you need to find out the time when the script started executing,
   

   @import url("css/widgContent.css");

   
   INSERT:CONTENT:END SERVER['REQUESIME'] is preferred to

   time()

   
   
10. See if you can use strncasecmp, strpbrk and stripos instead of regex
    

11. str_replace

    is faster than

    preg_replace

    , but

    strtr

    is faster than

    str_replace

    by a factor of 4
    
12. If the function, such as string replacement function, accepts
    both arrays and single characters as arguments, and if your argument
    list is not too long, consider writing a few redundant replacement
    statements, passing one character at a time, instead of one line of
    code that accepts arrays as search and replace arguments.
13. It's better to use select statements than multi if, else if, statements.
    
14. Error suppression with @ is very slow.
    
15. Turn on apache's mod_deflate
    
16. Close your database connections when you're done with them
    

17. $row['id']

    is 7 times faster than

    $row[id]

    
    
18. Error messages are expensive
    
19. Do not use functions inside of for loop, such as

    for ($x=0; $x < count($array); $x)

    The count() function gets called each time.
    
20. Incrementing a local variable in a method is the fastest. Nearly the same as calling a local variable in a function.
    
21. Incrementing a global variable is 2 times slow than a local var.
    
22. Incrementing an object property (eg.

    $this->prop++

    ) is 3 times slower than a local variable.
    
23. Incrementing an undefined local variable is 9-10 times slower than a pre-initialized one.
    
24. Just declaring a global variable without using it in a
    function also slows things down (by about the same amount as
    incrementing a local var). PHP probably does a check to see if the
    global exists.
25. Method invocation appears to be independent of the number of
    methods defined in the class because I added 10 more methods to the
    test class (before and after the test method) with no change in
    performance.
26. Methods in derived classes run faster than ones defined in the base class.
    
27. A function call with one parameter and an empty function body takes about the same time as doing 7-8

    $localvar++

    operations. A similar method call is of course about 15

    $localvar++

    operations.
    
28. Surrounding your string by ' instead of “

    will make things interpret a little faster since php looks for variables inside

    �..." but not inside '...'. Of course you can only do this when you don't need to have variables in the string.
    
29. When echoing strings it's faster to separate them by comma
    instead of dot. Note: This only works with echo, which is a function
    that can take several strings as arguments.
30. A PHP script will be served at least 2-10 times slower than
    a static HTML page by Apache. Try to use more static HTML pages and
    fewer scripts.
31. Your PHP scripts are recompiled every time unless the
    scripts are cached. Install a PHP caching product to typically increase
    performance by 25-100% by removing compile times.
32. Cache as much as possible. Use memcached - memcached is a
    high-performance memory object caching system intended to speed up
    dynamic web applications by alleviating database load. OP code caches
    are useful so that your script does not have to be compiled on every
    request
33. When working with strings and you need to check that the
    string is either of a certain length you'd understandably would want to
    use the strlen() function. This function is pretty quick since it's
    operation does not perform any calculation but merely return the
    already known length of a string available in the zval structure
    (internal C struct used to store variables in PHP). However because
    strlen() is a function it is still somewhat slow because the function
    call requires several operations such as lowercase & hashtable
    lookup followed by the execution of said function. In some instance you
    can improve the speed of your code by using an isset() trick.

    Example:

    if (strlen($foo) < 5) { echo "Foo is too short"; }
    

    vs.

    
    

    if (!isset($foo{5})) { echo "Foo is too short"; }
    

    Calling isset() happens to be faster then strlen() because
    unlike strlen(), isset() is a language construct and not a function
    meaning that it's execution does not require function lookups and
    lowercase. This means you have virtually no overhead on top of the
    actual code that determines the string's length.

    
    
34. When incrementing or decrementing the value of the variable

    $i++

    happens to be a tad slower then

    ++$i

    .
    This is something PHP specific and does not apply to other languages,
    so don't go modifying your C or Java code thinking it'll suddenly
    become faster, it won't.

    ++$i

    happens to be faster in PHP because instead of 4 opcodes used for

    $i++

    
    you only need 3. Post incrementation actually causes in the creation of
    a temporary var that is then incremented. While pre-incrementation
    increases the original value directly. This is one of the optimization
    that opcode optimized like Zend's PHP optimizer. It is a still a good
    idea to keep in mind since not all opcode optimizers perform this
    optimization and there are plenty of ISPs and servers running without
    an opcode optimizer.
35. Not everything has to be OOP, often it is too much overhead, each method and object call consumes a lot of memory.
    
36. Do not implement every data structure as a class, arrays are useful, too
    
37. Don't split methods too much, think, which code you will really re-use
    
38. You can always split the code of a method later, when needed
    
39. Make use of the countless predefined functions
    
40. If you have very time consuming functions in your code, consider writing them as C extensions
    
41. Profile your code. A profiler shows you, which parts of your
    code consumes how many time. The Xdebug debugger already contains a
    profiler. Profiling shows you the bottlenecks in overview
42. mod_gzip which is available as an Apache module compresses your data on the fly and can reduce the data to transfer up to 80%
    
43. Excellent Article about optimizing php by John Lim

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