如何使用 substr 在不同位置使用两个字符串来获取标题

Question

示例标题：动漫标题：第 01 集，第 01 集字幕

您好，我正在尝试获取标题中的 "Episode 01"，但我在使用 substr() 函数时遇到了问题，我该如何在其上声明命令？

$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 );
}

Answer 1

从技术上讲，这并不是真正的 WP 问题，可能应该在 PHP 或一般编程论坛上提问。

从您提供的代码中我可以了解到，您认为冒号总是存在的:，有时可能会有逗号,，您可能需要看一下expode() rather than substr() + strpos().

首先，要回答您的问题，您还需要逗号的位置，这样您就可以告诉 substr() 在何处停止。

$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，这一切都可以简化为 explode():

// - 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] );

长格式：

$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

我希望这不会太混乱。

Answer 2

您可以像这样使用辅助函数：

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;

如何使用 substr 在不同位置使用两个字符串来获取标题

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

php

title