php生成gif动画的方法

发布时间：2020-05-23 18:57:48 所属栏目：PHP 来源：互联网

导读：这篇文章主要介绍了php合成或者创建gif动画，并提供了两个实例，感兴趣的小伙伴们可以参考一下

首先需要确认GD库是否正常，如果是合成图片，请确保把分解的图片放在frames的文件夹里面。 GIFEncoder.class.php 类

var $BUF = Array ( ); 
var $LOP = 0; 
var $DIS = 2; 
var $COL = -1; 
var $IMG = -1; 

var $ERR = Array ( 
    'ERR00' =>"Does not supported function for only one image!",'ERR01' =>"Source is not a GIF image!",'ERR02' =>"Unintelligible flag ",'ERR03' =>"Could not make animation from animated GIF source",); 

/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFEncoder... 
:: 
*/ 
function GIFEncoder    ( 
                        $GIF_src,$GIF_dly,$GIF_lop,$GIF_dis,$GIF_red,$GIF_grn,$GIF_blu,$GIF_mod 
                    ) { 
    if ( ! is_array ( $GIF_src ) && ! is_array ( $GIF_tim ) ) { 
        printf    ( "%s: %s",$this->VER,$this->ERR [ 'ERR00' ] ); 
        exit    ( 0 ); 
    } 
    $this->LOP = ( $GIF_lop > -1 ) ? $GIF_lop : 0; 
    $this->DIS = ( $GIF_dis > -1 ) ? ( ( $GIF_dis < 3 ) ? $GIF_dis : 3 ) : 2; 
    $this->COL = ( $GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1 ) ? 
                    ( $GIF_red | ( $GIF_grn << 8 ) | ( $GIF_blu << 16 ) ) : -1; 

    for ( $i = 0; $i < count ( $GIF_src ); $i++ ) { 
        if ( strToLower ( $GIF_mod ) == "url" ) { 
            $this->BUF [ ] = fread ( fopen ( $GIF_src [ $i ],"rb" ),filesize ( $GIF_src [ $i ] ) ); 
        } 
        else if ( strToLower ( $GIF_mod ) == "bin" ) { 
            $this->BUF [ ] = $GIF_src [ $i ]; 
        } 
        else { 
            printf    ( "%s: %s ( %s )!",$this->ERR [ 'ERR02' ],$GIF_mod ); 
            exit    ( 0 ); 
        } 
        if ( substr ( $this->BUF [ $i ],6 ) != "GIF87a" && substr ( $this->BUF [ $i ],6 ) != "GIF89a" ) { 
            printf    ( "%s: %d %s",$i,$this->ERR [ 'ERR01' ] ); 
            exit    ( 0 ); 
        } 
        for ( $j = ( 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ),$k = TRUE; $k; $j++ ) { 
            switch ( $this->BUF [ $i ] { $j } ) { 
                case "!": 
                    if ( ( substr ( $this->BUF [ $i ],( $j + 3 ),8 ) ) == "NETSCAPE" ) { 
                        printf    ( "%s: %s ( %s source )!",$this->ERR [ 'ERR03' ],( $i + 1 ) ); 
                        exit    ( 0 ); 
                    } 
                    break; 
                case ";": 
                    $k = FALSE; 
                    break; 
            } 
        } 
    } 
    GIFEncoder::GIFAddHeader ( ); 
    for ( $i = 0; $i < count ( $this->BUF ); $i++ ) { 
        GIFEncoder::GIFAddFrames ( $i,$GIF_dly [ $i ] ); 
    } 
    GIFEncoder::GIFAddFooter ( ); 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFAddHeader... 
:: 
*/ 
function GIFAddHeader ( ) { 
    $cmap = 0; 

    if ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x80 ) { 
        $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) ); 

        $this->GIF .= substr ( $this->BUF [ 0 ],6,7        ); 
        $this->GIF .= substr ( $this->BUF [ 0 ],13,$cmap    ); 
        $this->GIF .= "!37713NETSCAPE2.031" . GIFEncoder::GIFWord ( $this->LOP ) . ""; 
    } 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFAddFrames... 
:: 
*/ 
function GIFAddFrames ( $i,$d ) { 

    $Locals_str = 13 + 3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); 

    $Locals_end = strlen ( $this->BUF [ $i ] ) - $Locals_str - 1; 
    $Locals_tmp = substr ( $this->BUF [ $i ],$Locals_str,$Locals_end ); 

    $Global_len = 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ); 
    $Locals_len = 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ); 

    $Global_rgb = substr ( $this->BUF [ 0 ],3 * ( 2 << ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ) ) ); 
    $Locals_rgb = substr ( $this->BUF [ $i ],3 * ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ) ); 

    $Locals_ext = "!xF9x04" . chr ( ( $this->DIS << 2 ) + 0 ) . 
                    chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . "x0x0"; 

    if ( $this->COL > -1 && ord ( $this->BUF [ $i ] { 10 } ) & 0x80 ) { 
        for ( $j = 0; $j < ( 2 << ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ) ); $j++ ) { 
            if    ( 
                    ord ( $Locals_rgb { 3 * $j + 0 } ) == ( $this->COL >> 0 ) & 0xFF && 
                    ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >> 8 ) & 0xFF && 
                    ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF 
                ) { 
                $Locals_ext = "!xF9x04" . chr ( ( $this->DIS << 2 ) + 1 ) . 
                                chr ( ( $d >> 0 ) & 0xFF ) . chr ( ( $d >> 8 ) & 0xFF ) . chr ( $j ) . "x0"; 
                break; 
            } 
        } 
    } 
    switch ( $Locals_tmp { 0 } ) { 
        case "!": 
            $Locals_img = substr ( $Locals_tmp,8,10 ); 
            $Locals_tmp = substr ( $Locals_tmp,18,strlen ( $Locals_tmp ) - 18 ); 
            break; 
        case ",": 
            $Locals_img = substr ( $Locals_tmp,10,strlen ( $Locals_tmp ) - 10 ); 
            break; 
    } 
    if ( ord ( $this->BUF [ $i ] { 10 } ) & 0x80 && $this->IMG > -1 ) { 
        if ( $Global_len == $Locals_len ) { 
            if ( GIFEncoder::GIFBlockCompare ( $Global_rgb,$Locals_rgb,$Global_len ) ) { 
                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp ); 
            } 
            else { 
                $byte = ord ( $Locals_img { 9 } ); 
                $byte |= 0x80; 
                $byte &= 0xF8; 
                $byte |= ( ord ( $this->BUF [ 0 ] { 10 } ) & 0x07 ); 
                $Locals_img { 9 } = chr ( $byte ); 
                $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp ); 
            } 
        } 
        else { 
            $byte = ord ( $Locals_img { 9 } ); 
            $byte |= 0x80; 
            $byte &= 0xF8; 
            $byte |= ( ord ( $this->BUF [ $i ] { 10 } ) & 0x07 ); 
            $Locals_img { 9 } = chr ( $byte ); 
            $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp ); 
        } 
    } 
    else { 
        $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp ); 
    } 
    $this->IMG = 1; 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFAddFooter... 
:: 
*/ 
function GIFAddFooter ( ) { 
    $this->GIF .= ";"; 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFBlockCompare... 
:: 
*/ 
function GIFBlockCompare ( $GlobalBlock,$LocalBlock,$Len ) { 

    for ( $i = 0; $i < $Len; $i++ ) { 
        if    ( 
                $GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } || 
                $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } || 
                $GlobalBlock { 3 * $i + 2 } != $LocalBlock { 3 * $i + 2 } 
            ) { 
                return ( 0 ); 
        } 
    } 

    return ( 1 ); 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GIFWord... 
:: 
*/ 
function GIFWord ( $int ) { 

    return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) ); 
} 
/* 
::::::::::::::::::::::::::::::::::::::::::::::::::: 
:: 
::    GetAnimation... 
:: 
*/ 
function GetAnimation ( ) { 
    return ( $this->GIF ); 
}

}

为大家分享两个实例供大家参考：

实例 1 合成gif动画：

image_stream = new GIFEncoder  ( 
          URL or Binary data 'Sources' 
          int         'Delay times' 
          int         'Animation loops' 
          int         'Disposal' 
          int         'Transparent red,green,blue colors' 
          int         'Source type' 
        );

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