直接看代码
<?php
$arr = '[{"url":"gray-01.jpg","alt":"Gray"},{"url":"gray-02.jpg","alt":"Gray"},{"url":"gray-03.jpg","alt":"Gray"},{"url":"gray-04.jpg","alt":"Gray"},{"url":"gray-05.jpg","alt":"Gray"},{"url":"Yellow-01.jpg","alt":"Yellow"},{"url":"Yellow-02.jpg","alt":"Yellow"},{"url":"Yellow-03","alt":"Yellow"},{"url":"Yellow-04","alt":"Yellow"}]';
if($arr ==""){ #判断pictureurls字段为空
$img1 = "null";
$img2 = "null";
}else{
$urls_data = json_decode( $arr, true );
$i = 0;
foreach ( $urls_data as $values ) {
if ( $values[ 'alt' ] == "Yellow" ) { #判断数组存在alt颜色键值，输出对应前两条;else输出默认的前两条
if($i==0){$img1 = $values['url'];}
if($i==1){$img2 = $values['url'];}
$i++;
} else {
$img1 = $urls_data[0]['url'];
$img2 = $urls_data[1]['url'];
}
}
}
echo $img1 . "<br>";
echo $img2 . "<br>";
?>发表评论:
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