Question

假设有一个输入：

 <?php
    $all_product = mysqli_query($connect, "SELECT * FROM product WHERE user_id='$fetch_user_id'");
    $i= 0;
    $m=5;
    echo '<table width="100%" margin-left="30px" style="background-color:white;">';
    while ($all = mysqli_fetch_array($all_product)) {
    if($i%5==0) {
    echo "<tr>";
                }
    echo '<td style="width:20%">';
    echo '<img src="'.$all['image'].'" width="150px" height="150px" />
    <div class="search_details">
    <figcaption>'.$all['name'].'</figcaption>
    <figcaption>by '.$all['brand'].'</figcaption><figcaption>&#8360;'.$all['price'].'</figcaption>
    <figcaption>Save: &#8360;'.$local_price.', ('.$all['discount'].'%)</figcaption><figcaption>In stock: '.$all['stock'] .'</figcaption></div>';
    echo "</td>";
    if($i%$m==$m - 1){
    echo "</tr>";
                 }
    $i++;
                 }
    echo "</table>";
    ?>

我们正试图将其输出为

1,2,C

到目前为止尝试从这里修改： Is there a way to create key-value pairs in Bash script?

KEY=1, VAL1=2, VAL2=C

输出：

for i in 1,2,C ; do KEY=${i%,*,*}; VAL1=${i#*,}; VAL2=${i#*,*,}; echo $KEY" XX "$VAL1 XX "$VAL2"; done

不完全确定上面的磅（“＃”）和％是什么意思，使修改变得有点困难。

任何一位大师能开导吗？感谢。

Answer 1

我通常更喜欢更容易阅读代码，因为bash可以很快变得丑陋。

试试这个：

<强> key_values.sh

#!/bin/bash

IFS=,
count=0
# $* is the expansion of all the params passed in, i.e. $1, $2, $3, ...
for i in $*; do
    # '-eq' is checking for equality, i.e. is $count equal to zero.
    if [ $count -eq 0 ]; then
        echo -n "KEY=$i"
    else
        echo -n ", VAL${count}=$i"
    fi
    count=$(( $count + 1 ))
done

echo

示例

key_values.sh 1,2,ABC,123,DEF

<强>输出

KEY=1, VAL1=2, VAL2=ABC, VAL3=123, VAL4=DEF

Answer 2

扩大anishsane的评论：

$ echo $1
1,2,3,4,5

$ IFS=, read -ra args <<<"$1"     # read into an array

$ out="KEY=${args[0]}"

$ for ((i=1; i < ${#args[@]}; i++)); do out+=", VAL$i=${args[i]}"; done

$ echo "$out"
KEY=1, VAL1=2, VAL2=3, VAL3=4, VAL4=5

bash读取字符串并输出为一个键和多个值

2 个答案: