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Can you help me with a regular expression for this:
$value = '["number"]';
or
$value = '["number","number"]';
or
$value = '["number","number","number"]';
or
...
...
...
...
$value = '["number","number","number","number","number","number","number"......,"number"]';
//$number can be rand(0, 99.....999);
I need the result to be validated as true or false!
Here is my version:
function test($v)
{
if (preg_match('/^\\[("number")(,"number")*\\]$/', $v))
echo 'ok<br>';
else
echo 'fail<br>';
}
or if "number" is really digits, this one:
function test($v)
{
if (preg_match('/^\\[("[0-9]+")(,"[0-9]+")*\\]$/', $v))
echo 'ok<br>';
else
echo 'fail<br>';
}
NOTE - only positive naturals are accepted, need to change to negative and decimal/floating numbers
Do you really need to use PCRE? Your example is valid json.
$array = json_decode('["number", "number", "123"]');
var_dump($array);
If you need numbers only, you can filter it.
$new_array = array_filter($array, 'ctype_digit');
$result = count($array) == $new_array? $new_array : null;
var_dump($result);
Related
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I have array with numbers and variable number:
$a = array(1,2,3,4,5,6,7,8,9,10);
$v = 5;
I need result all numbers if is higher as $v:
$result = ?? //array(6,7,8,9,10)
<?php
$a = array(1,2,3,4,5,6,7,8,9,10);
$v = 5;
foreach($a as $value){
if($value > $v ){
$new[] = $value;
}
}
echo "<pre>";
print_r($new);
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An array has negative and positive numbers. Separate the numbers such that negative numbers are at the beginning and positive numbers at the end without changing the order.
Example:
Array = {1, -3, -5, 9 , -8}
O/P = {-3, -5, -8, 1, 9}
I found many answer in c , c++ , java but not in PHP , so can any one please let me know how or better way to achieve this?
However this question put on hold , i tried with some of solutions and
find my own answer added below , hope it might be useful for someone.
function part($arr){
$j = 0;
for($i=0;$i<count($arr);$i++){
$val = $arr[$i];
$k = $i;
while($k>$j && $val < 0){
$arr[$k] = $arr[$k-1];
$k = $k-1;
if($j==$k){
$j=$j+1;
}
$arr[$k] = $val;
}
}
return $arr;
}
$arr = array(1, -3, -5, 9 , -8);
print_r(part($arr));
Without doing all the work for you.
Look into array_filter you could filter the negative values into 1 array, then filter the positive values into another array.
Then use array_merge to merge the 2.
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please help me.
so how to find word position in sentece.
ex : one two five six seven two.
finding : two.
answer : 2 and 6
$needle = 'two';
$positions = array_keys(
array_filter(
str_word_count($sentence, 1),
function ($value) use ($needle) {
return $value == $needle;
}
)
);
EDIT
If you really need the offset of the first word to be 1 rather than 0, then modify the above so:
$positions = array_map(
function($position) {
return ++$position;
},
array_keys(
array_filter(
str_word_count($sentence, 1),
function ($value) use ($needle) {
return $value == $needle;
}
)
)
);
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I am trying to calculate two variables type "String" in php.
and I try all alternative but steady amount missing values.
example:
$a = "250,000.50";
$b = "30,000.00";
echo $a - $b;
I want to return value with same format ###,###,###.## -String -Decimal -only return same format.
Note: I try all the link format currency here...use regex, sprintf, replace, etc...
but always lose a digit because the example use in format en_US or EUR.
Thanks!.
You can use this function for easily handle:
$a = "250,000.50";
$b = "30,000.00";
function currency($c=0){
return preg_replace("/[^\d\.]+/iu","",$c);
}
echo number_format(currency($a) - currency($b) ,2);
The subtraction on strings will auto-cast the strings into numbers for you, but you have to get rid of the commas first:
$a = "250,000.50";
$b = "30,000.00";
echo str_replace(',', '', $a) - str_replace(',', '', $b);
Oh, and wrap the whole thing in number_format to get it back to the comma format:
echo number_format( str_replace(',', '', $a) - str_replace(',', '', $b), 2);
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My code:
<?php
$string = "hello world";
echo $string[1]; //output is 'e'
echo end($string); // I've got a warning error
?>
How can I exchange my string variable to an array format?
I think if I exchange it the problem will solve.
$string[n] is a specific notation to access the nth offset of a string. This does not mean the string is an array, it's just special syntactic sugar. If you want the last offset of the string, use substr($string, -1).
There is a predefined function that do this. It's str_split(). Here http://it.php.net/manual/en/function.str-split.php you find the doc
Just do this:
echo substr($string, -1);
Because a string is not natively an array, functions like end and array_sort don't work.
To physically cast the string, use this:
function CastStringToArray($string)
{
$ret = array();
$length = strlen($string);
for ($i = 0; $i < $length; $i++)
{
$ret[] = $string[$i];
}
return $ret;
}