function chkChecks(){
isChecked=false

for(var i=0;i<document.forms["new_page"]["allowed[]“].length;i++)
{
if(document.forms["new_page"]["allowed[]“][i].checked)
{
isChecked=true
}
}

if(!isChecked){
alert(“please choose at least one checkbox”);
return false;
}

}

</script>

<form name=”new_page” action=”">
<input type=”checkbox” name=”allowed[]” value=”2″>
<input type=”checkbox” name=”allowed[]” value=”2″>
<input type=”checkbox” name=”allowed[]” value=”2″>
<input type=”button” value=”Toevoegen” onclick=”chkChecks()”>
</form>

 

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 ‘ ‘,’ ‘

Copied!!!

function roundvalue ()
{
var input = 55.24578;
var num = new Number (parseFloat (input));
var rounded = num.toFixed (2);
alert(rounded);
}

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