如何在 PHP 中对字符串进行切片？

How to slice a string in PHP?

提问by Cecil Rodriguez

Ok, so I've got this string:

好的，所以我有这个字符串：

"MICROSOFT CORP CIK#: 0000789019 (see all company filings)"

And I would like to cut off everything after the "CORP"bit. How would I go about doing this in PHP? I am used to Python so I am not sure how this is done.

我想"CORP"在位之后切断一切。我将如何在 PHP 中执行此操作？我习惯了 Python，所以我不确定这是如何完成的。

To be clear, this is the output I want:

需要明确的是，这是我想要的输出：

"MICROSOFT CORP"

I am trying:

我在尝试：

$companyname = substr($companyname, 0, strpos($companyname, " CIK"));

and I am getting nothing showing.

我什么也没显示。

Here is my full code:

这是我的完整代码：

<?php
include 'simple_html_dom.php';
$html = file_get_html('http://www.sec.gov/cgi-bin/browse-edgar?company=&match=&CIK=MSFT&filenum=&State=&Country=&SIC=&owner=exclude&Find=Find+Companies&action=getcompany');
$companyname = $html->find('span[class=companyName]', 0);
$companyname = substr($companyname, 0, strpos($companyname, " CIK#")+5);
$bizadd = $html->find('div[class="mailer"]');
echo $companyname;
echo "<br />";
foreach ($bizadd as $value) {
    $addvals = $value->find('span[class="mailerAddress"]');
    echo "<br />";
    foreach ($addvals as $value) {
        echo $value;
        echo "<br />";
    }
}
?>

回答by Dvir Azulay

You can either use explode()(http://php.net/explode) or a mix of substr()(http://php.net/substr) with strpos()(http://php.net/strpos).

您可以使用explode()( http://php.net/explode) 或substr()( http://php.net/substr) 与strpos()( http://php.net/strpos) 的混合。

<?php
$string = "MICROSOFT CORP CIK#: 0000789019 (see all company filings)";
$newString = substr($string, 0, strpos($string, " CIK#"));
echo $newString;

Edit:edited a few times to fit your question editing...

编辑：编辑了几次以适合您的问题编辑...

回答by Jon

You 'd find the position of "CORP"with strpos(be sure to read the giant red warning) and then cut off the relevant part with substr.

你会找到"CORP"with的位置strpos（一定要阅读巨大的红色警告），然后用 切断相关部分substr。

回答by akinuri

I came to this page looking for a slice slice($start, $end)method, but only found case-specific solutions.

我来到这个页面寻找切片slice($start, $end)方法，但只找到了特定于案例的解决方案。

In my case, I only have indexes (start and end). The need for a lengthto slice a string seemed silly. So I wrote a slice function. It mimics JavaScript's slicemethod.

就我而言，我只有索引（开始和结束）。需要对length字符串进行切片似乎很愚蠢。所以我写了一个切片函数。它模仿了 JavaScript 的slice方法。

// str_slice(string $str, int $start [, int $end])
function str_slice() {
    $args = func_get_args();
    switch (count($args)) {
        case 1:
            return $args[0];
        case 2:
            $str        = $args[0];
            $str_length = strlen($str);
            $start      = $args[1];
            if ($start < 0) {
                if ($start >= - $str_length) {
                    $start = $str_length - abs($start);
                } else {
                    $start = 0;
                }
            }
            else if ($start >= $str_length) {
                $start = $str_length;
            }
            $length = $str_length - $start;
            return substr($str, $start, $length);
        case 3:
            $str        = $args[0];
            $str_length = strlen($str);
            $start      = $args[1];
            $end        = $args[2];
            if ($start >= $str_length) {
                return "";
            }
            if ($start < 0) {
                if ($start < - $str_length) {
                    $start = 0;
                } else {
                    $start = $str_length - abs($start);
                }
            }
            if ($end <= $start) {
                return "";
            }
            if ($end > $str_length) {
                $end = $str_length;
            }
            $length = $end - $start;
            return substr($str, $start, $length);
    }
    return null;
}


var_dump( str_slice("abcdefghijklmnopqrstuvwxyz")          ); // "abcdefghijklmnopqrstuvwxyz"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", 5)       ); // "fghijklmnopqrstuvwxyz"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -5)      ); // "vwxyz"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", 40)      ); // ""
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -40)     ); // "abcdefghijklmnopqrstuvwxyz"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", 5, 10)   ); // "fghij"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", 5, 20)   ); // "fghijklmnopqrst"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", 5, 30)   ); // "fghijklmnopqrstuvwxyz"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -20, 2)  ); // ""
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -20, 10) ); // "ghij"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -20, 15) ); // "ghijklmno"
var_dump( str_slice("abcdefghijklmnopqrstuvwxyz", -20, 40) ); // "ghijklmnopqrstuvwxyz"

回答by JRL

Assuming your string is stored in $a, then any of

假设您的字符串存储在 $a 中，那么任何

echo substr($a, 0, strpos($a, " CIK"));

or

或者

preg_match("/(.*) CIK/", $a, $matches);
echo $matches[1];

or

或者

echo preg_replace("/(.*) CIK.*/", "", $a);

will do.

会做。