PHP Programming Tips

Variable Operations

  • Operating on an initialized variable is 376% faster than operating on an unitialized variable.

  • Constants are 146% slower than variables

  • Local variables are 9.9% faster than global variables


String Functions

  • 'String' is 0.26% faster than "String"

  • "String" is 4% faster than HEREDOC syntax

  • "String\n" is 108% faster than 'String'."\n"

  • 'String'.$var is 28% faster than "String$var"

  • 'string '.$var.' string' is 55% faster than sprintf('string %s string', $var)

  • "\n" is 70% faster than chr(10)

  • strnatcmp() is 4.95% faster than strcmp()

  • strcasecmp() is 45% faster than preg_match()

  • strcasecmp() is 6.6% faster than strtoupper($string) == "STRING"

  • strcasecmp() is 13% faster than strnatcasecmp()

  • strtr($string, $string1, $string2) is 10% faster than str_replace()

  • str_replace() is 161% faster than strtr($string, $array)

  • stristr() is 10% faster than stripos()

  • strpos() is 9.7% faster than strstr()

  • isset($str{5}) is 176% faster than strlen($str) > 5

  • str_replace($str, $str, $str) twice is 17% faster than str_replace(array, array, string)

  • list() = explode() is 13% faster than substr($str, strpos($str))


Numeric Functions

  • ++$int is 10% faster than $int++

  • (float) is 48% faster than settype($var, 'float')


Array Functions

  • list() = $array; is 3.4% faster than assigning each variable

  • in_array() is 6% faster than array_search

  • isset($array[$key]) is 230% faster than array_key_exists()

  • !empty($array) is 66% faster than count($array)


Output Functions

  • echo is 5% faster than print()

  • echo ' '.' ' is 0.44% faster than echo ' ',' '

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