duanbixia7738
duanbixia7738
2017-05-01 15:43
浏览 71
已采纳

如何从字符串中获取数字/浮点数

I want to get the (first) price of each string row, with out the $ sign and it could be an int or float and there could be more numbers in the row.

example:

$str_array=(
"Up to $1.9 per Install in RU",
"1.3 per iOS Install in UAE and SA",
"$2.1 per iOS and Android Registration in US",
"Up to $2.5 per Android Install in 7 countries",
"Up to $1 per iOS Install in SA"
);

Expected output:

1.9
1.3
2.1
2.5
1

I tried something like this

$re = '/[+-]?([0-9]*[.])?[0-9]+/';
$str = 'Up to $2.5 per Android Install in 7 countries';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
var_dump($matches);   

and i get this

[0] => Array
    (
        [0] => 2.5
        [1] => 2.
    )

[1] => Array
    (
        [0] => 7
    )

but its not working good. :(

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3条回答 默认 最新

  • duanmeng7865
    duanmeng7865 2017-05-01 15:54
    已采纳

    Here is my version:

    <?php
    $data = [
        'Up to $1.9 per Install in RU',
        '1.3 per iOS Install in UAE and SA',
        '$2.1 per iOS and Android Registration in US',
        'Up to $2.5 per Android Install in 7 countries',
        'Up to $1 per iOS Install in SA'
    ];
    
    array_walk($data, function(&$line){
        preg_match('/(\d+(?:\.\d+)?)/', $line, $tokens);
        if (count($tokens)>1) {
            var_dump(floatval($tokens[1]));
        }
    });
    

    The output obviously is:

    float(1.9)
    float(1.3)
    float(2.1)
    float(2.5)
    float(1)
    
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  • dongzhan5246
    dongzhan5246 2017-05-01 15:48

    Hope this will help you out,

    Regex: \d+(?:\.\d+)?

    1. \d+ this will match digits

    2. (?:\.\d+)? this will optionally match decimal part

    Try this code snippet here

    <?php
    ini_set('display_errors', 1);
    
    $str_array=array(
    "Up to $1.9 per Install in RU",
    "1.3 per iOS Install in UAE and SA",
    "$2.1 per iOS and Android Registration in US",
    "Up to $2.5 per Android Install in 7 countries",
    "Up to $1 per iOS Install in SA"
    );
    $result=array();
    foreach($str_array as $string)
    {
        preg_match_all('/[\d]+(?:\.[\d]+)?/',$string,$matches);
        $result[]=$matches[0][0];
    }
    print_r($result);
    

    Output:

    Array
    (
        [0] => 1.9
        [1] => 1.3
        [2] => 2.1
        [3] => 2.5
        [4] => 1
    )
    
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  • dongsi3826
    dongsi3826 2017-05-01 15:54

    To select only the first number in a line add condition that there is no digit before

    ^(?:[^\d]+)([+-]?(?:[0-9]*[.])?[0-9]+)
    

    demo and explanation

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