php把json文件格式化压缩成一行

项目需要，把格式化好的json文件去掉所有空格和换行，压缩成最小
就有了一下代码

<?php
$src_path = "./out/cli/json/";
$dst_path = "./compress/";

$files = glob($src_path . "*.json");

foreach($files as $file){
    $in_file = $file;
    // echo "in file: " . $in_file . "\n";
    $text = file_get_contents($in_file);
    $return = compress($text);
    $out_file = str_replace($src_path, $dst_path, $file);
    // echo "out file: " . $out_file . "\n";
    file_put_contents($out_file, $return);
}

function compress($text)
{
    return preg_replace("/(\r\n|\n|\r|\t)/i", '', $text);
}

?>

原来的json内容

{"data_get_from_sheets" : "[活跃宝箱]",
"data_get_length" : 4,
"data_get" : {
	"1":{"index":1,"activity":25,"rewards":[[3,20],[1,10000]]},
	"2":{"index":2,"activity":50,"rewards":[[3,30],[10401,2]]},
	"3":{"index":3,"activity":75,"rewards":[[3,50],[37001,1]]},
	"4":{"index":4,"activity":100,"rewards":[[3,100],[1,50000]]}
},
"data_sign_info_from_sheets" : "[通用活动报名]",
"data_sign_info_length" : 4,
"data_sign_info" : {
	"1":{"id":1,"desc":"<font color=#d95014>冠军赛</font>马上开始！谁将登上冠军宝座，参与比赛和趣味竞猜可活动丰厚奖励哦~","items":[50012,1,8,29905],"time":10,"cancel":"取消","ok":"前往参与"},
	"2":{"id":2,"desc":"<font color=#d95014>冠军赛</font>已经开始啦，正在进行竞猜阶段。是否前往参与竞猜？","items":[50012,1,8,29905],"time":10,"cancel":"取消","ok":"前往参与"},
	"3":{"id":3,"desc":"<font color=#d95014>众神战场</font>马上开始啦，正在进行报名阶段，快来参与强者之间的较量吧！","items":[50603,8,10030,30302,2],"time":10,"cancel":"取消","ok":"前往报名"},
	"4":{"id":4,"desc":"<font color=#d95014>众神战场</font>正在进行中，大量奖励等你来拿，是否进入？","items":[50603,8,10030,30302,2],"time":10,"cancel":"取消","ok":"进入战场"}
}
}

压缩后变成

{"data_get_from_sheets":"[活跃宝箱]","data_get_length":4,"data_get":{"1":{"index":1,"activity":25,"rewards":[[3,20],[1,10000]]},"2":{"index":2,"activity":50,"rewards":[[3,30],[10401,2]]},"3":{"index":3,"activity":75,"rewards":[[3,50],[37001,1]]},"4":{"index":4,"activity":100,"rewards":[[3,100],[1,50000]]}},"data_sign_info_from_sheets":"[通用活动报名]","data_sign_info_length":4,"data_sign_info":{"1":{"id":1,"desc":"<font color=#d95014>冠军赛</font>马上开始！谁将登上冠军宝座，参与比赛和趣味竞猜可活动丰厚奖励哦~","items":[50012,1,8,29905],"time":10,"cancel":"取消","ok":"前往参与"},"2":{"id":2,"desc":"<font color=#d95014>冠军赛</font>已经开始啦，正在进行竞猜阶段。是否前往参与竞猜？","items":[50012,1,8,29905],"time":10,"cancel":"取消","ok":"前往参与"},"3":{"id":3,"desc":"<font color=#d95014>众神战场</font>马上开始啦，正在进行报名阶段，快来参与强者之间的较量吧！","items":[50603,8,10030,30302,2],"time":10,"cancel":"取消","ok":"前往报名"},"4":{"id":4,"desc":"<font color=#d95014>众神战场</font>正在进行中，大量奖励等你来拿，是否进入？","items":[50603,8,10030,30302,2],"time":10,"cancel":"取消","ok":"进入战场"}}}

搞掂.