我如何获得标题使用substr与两个字符串在不同的位置 - How do I get the title using substr with two string in different position

How do I get the title using substr with two string in different position

示例标题:动漫标题:第01集，字幕01

嗨，我想在标题中获得"第01集"，但我遇到了substr()函数的麻烦，我如何声明它的命令?

$Updated =  get_the_title();
if ( strpos( $Updated , ":" ) && ( strripos( $Updated, "," ) ) ) {
  // this is the line I'm having trouble to deal with
  $Updated = substr( $Updated , strpos( $Updated , ":" ) + 1 );
} else if ( strpos( $Updated , ":" ) ) {
  $Updated = substr( $Updated , strpos( $Updated , ":" ) + 1 );
}

从技术上讲，这不是一个真正的WP问题，可能应该在PHP或通用编程论坛上问。

我可以从你提供的代码中得到的是，你相信总会有一个冒号:，有时可能会有一个逗号,，你可能想看看expode()而不是substr() + strpos()。

首先，要回答你的问题，你也需要逗号的位置，这样你就可以告诉substr()在哪里停止。

$updated = get_the_title();
// calculate the string positions once rather than multiple times
// first colon
$colon_pos = strpos( $updated, ':' );
// first comma AFTER the colon
$comma_pos = strpos( $updated, ',', $colon_pos );
// MUST compare strpos values to false, it can return 0 (zero) which is falsy
if ( $colon_pos !== false && $comma_pos !== false ) {
  // start from the colon position plus 1
  // use comma position as the length, since it is based on the offset of the colon
  $updated = substr( $updated, $colon_pos + 1, $comma_pos );
} else if ( $colon_pos !== false ) {
  $updated = substr( $updated, $colon_pos + 1 );
}

如开头所述，这一切都可以用explode():

简化

// - first, split the title on the first colon ':', the second/last item of
// that action will be everything after the colon if there is a colon, or
// the whole title if there is no colon
// - second, grab that last item and split it on commas, the first/zeroth
// item of that action will be the episode
// - finally, trim off the excess whitespace
$updated = explode( ':', get_the_title(), 2 );
$updated = trim( explode( ',', end( $updated ) )[0] );

长形式:

$updated = get_the_title();             // the full title string
$updated = explode( ':', $updated, 2 ); // split it in two around the first ':'
$updated = end( $updated );             // grab the last element of the split
$updated = explode( ',', $updated );    // split the remainder on ','
$updated = trim( $updated[0] );         // get the first item after the split and remove excess whitespace

希望大家没有太困惑

您可以这样使用辅助函数:

function.php:

function get_string_between($string, $start, $end){
    $string = " ".$string;
    $ini = strpos($string,$start);
    if ($ini == 0) return "";
    $ini += strlen($start);
    $len = strpos($string,$end,$ini) - $ini;
    return substr($string,$ini,$len);
}

template_file.php:

$Updated = get_the_title();
$Updated = get_string_between($Updated , ":", ",");
echo $Updated;